Sort encoded `Skeleton` dictionary for backwards compatibility

Description

In #1970, we created our own SkeletonEncoder class to move away from using jsonpickle.encode. And, while the SkeletonEncoder paired with the SkeletonDecoder works perfectly fine, we get some strange behavior when trying to load Skeleton jsons across versions of SLEAP (that still use jsonpickle.decode).

The only difference seemed to be the ordering of the keys in the dictionaries; thus, this PR sorts the Skeleton dictionaries before encoding them - which has proven to do the trick with some manual testing across versions.

Unsorted skeleton (breaks backwards compatibility)

{"directed": true, "multigraph": true, "graph": {"name": "Skeleton-0", "num_edges_inserted": 46}, "nodes": [{"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["head", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["thorax", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["abdomen", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingL", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingR", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegL4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegR4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegL4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegR4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegL4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegR4", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeL", 1.0]}}}, {"id": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeR", 1.0]}}}], "links": [{"edge_insert_idx": 44, "type": {"py/reduce": [{"py/type": "sleap.skeleton.EdgeType"}, {"py/tuple": [1]}]}, "source": {"py/id": 1}, "target": {"py/id": 12}, "key": 0}, {"edge_insert_idx": 45, "type": {"py/id": 14}, "source": {"py/id": 1}, "target": {"py/id": 13}, "key": 0}, {"edge_insert_idx": 34, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 1}, "key": 0}, {"edge_insert_idx": 35, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 3}, "key": 0}, {"edge_insert_idx": 36, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 4}, "key": 0}, {"edge_insert_idx": 37, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 5}, "key": 0}, {"edge_insert_idx": 38, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 6}, "key": 0}, {"edge_insert_idx": 39, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 7}, "key": 0}, {"edge_insert_idx": 40, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 8}, "key": 0}, {"edge_insert_idx": 41, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 9}, "key": 0}, {"edge_insert_idx": 42, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 10}, "key": 0}, {"edge_insert_idx": 43, "type": {"py/id": 14}, "source": {"py/id": 2}, "target": {"py/id": 11}, "key": 0}]}

Sorted skeleton (backwards compatible)

{"directed": true, "graph": {"name": "Skeleton-0", "num_edges_inserted": 46}, "links": [{"edge_insert_idx": 44, "key": 0, "source": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["head", 1.0]}}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeL", 1.0]}}, "type": {"py/reduce": [{"py/type": "sleap.skeleton.EdgeType"}, {"py/tuple": [1]}]}}, {"edge_insert_idx": 45, "key": 0, "source": {"py/id": 1}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeR", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 34, "key": 0, "source": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["thorax", 1.0]}}, "target": {"py/id": 1}, "type": {"py/id": 3}}, {"edge_insert_idx": 35, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["abdomen", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 36, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingL", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 37, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingR", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 38, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 39, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegR4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 40, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 41, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegR4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 42, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 43, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegR4", 1.0]}}, "type": {"py/id": 3}}], "multigraph": true, "nodes": [{"id": {"py/id": 1}}, {"id": {"py/id": 5}}, {"id": {"py/id": 6}}, {"id": {"py/id": 7}}, {"id": {"py/id": 8}}, {"id": {"py/id": 9}}, {"id": {"py/id": 10}}, {"id": {"py/id": 11}}, {"id": {"py/id": 12}}, {"id": {"py/id": 13}}, {"id": {"py/id": 14}}, {"id": {"py/id": 2}}, {"id": {"py/id": 4}}]}

v1.3.3 Skeleton

{"directed": true, "graph": {"name": "Skeleton-0", "num_edges_inserted": 46}, "links": [{"edge_insert_idx": 44, "key": 0, "source": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["head", 1.0]}}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeL", 1.0]}}, "type": {"py/reduce": [{"py/type": "sleap.skeleton.EdgeType"}, {"py/tuple": [1]}]}}, {"edge_insert_idx": 45, "key": 0, "source": {"py/id": 1}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["eyeR", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 34, "key": 0, "source": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["thorax", 1.0]}}, "target": {"py/id": 1}, "type": {"py/id": 3}}, {"edge_insert_idx": 35, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["abdomen", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 36, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingL", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 37, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["wingR", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 38, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 39, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["forelegR4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 40, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 41, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["midlegR4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 42, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegL4", 1.0]}}, "type": {"py/id": 3}}, {"edge_insert_idx": 43, "key": 0, "source": {"py/id": 5}, "target": {"py/object": "sleap.skeleton.Node", "py/state": {"py/tuple": ["hindlegR4", 1.0]}}, "type": {"py/id": 3}}], "multigraph": true, "nodes": [{"id": {"py/id": 1}}, {"id": {"py/id": 5}}, {"id": {"py/id": 6}}, {"id": {"py/id": 7}}, {"id": {"py/id": 8}}, {"id": {"py/id": 9}}, {"id": {"py/id": 10}}, {"id": {"py/id": 11}}, {"id": {"py/id": 12}}, {"id": {"py/id": 13}}, {"id": {"py/id": 14}}, {"id": {"py/id": 2}}, {"id": {"py/id": 4}}]}

Types of changes

[x] Bugfix
[ ] New feature
[ ] Refactor / Code style update (no logical changes)
[ ] Build / CI changes
[ ] Documentation Update
[ ] Other (explain)

Does this address any currently open issues?

1972
1970
1961
1841

Outside contributors checklist

[ ] Review the guidelines for contributing to this repository
[ ] Read and sign the CLA and add yourself to the authors list
[ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
[ ] Add tests that prove your fix is effective or that your feature works
[ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

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talmolab / sleap