Clean up source distribution

[bollwyvl]

Modifications:

• add *.pyx to the sdist.
• remove top-level tests/
• remove entry_point

These changes would allow downstreams to build from the canonical source e.g. https://github.com/conda-forge/staged-recipes/pull/20988

Impacted submodules:

Any submodule with .pyx files.

This pull request:

(your PR must match these criteria before review)

• [x] targets the develop branch
• [x] does not decrease code coverage
• [ ] passes the tests
• [ ] is documented and the documentation build passes
• [ ] has PEP8-compliant code and explicit variable naming
• [ ] has a tutorial (facultative but recommended)

[codecov[bot]]

Codecov Report

Merging #544 (5daf7b3) into develop (933ccda) will decrease coverage by 0.22%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #544      +/-   ##
===========================================
- Coverage    98.48%   98.26%   -0.23%     
===========================================
  Files          193      193              
  Lines         8409     8454      +45     
===========================================
+ Hits          8282     8307      +25     
- Misses         127      147      +20     

Impacted Files	Coverage Δ
sknetwork/clustering/tests/test_post_processing.py	55.55% <0.00%> (-44.45%)	:arrow_down:
sknetwork/clustering/postprocess.py	63.63% <0.00%> (-36.37%)	:arrow_down:
sknetwork/gnn/layers.py	100.00% <0.00%> (ø)
sknetwork/path/search.py	100.00% <0.00%> (ø)
sknetwork/utils/neighbors.py	100.00% <0.00%> (ø)
sknetwork/utils/membership.py	100.00% <0.00%> (ø)
sknetwork/utils/tests/test_neighbors.py	100.00% <0.00%> (ø)
sknetwork/gnn/tests/test_gnn_classifier.py	100.00% <0.00%> (ø)
sknetwork/__init__.py
sknetwork/utils/tests/test_membership.py	100.00% <0.00%> (ø)
... and 2 more

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[bollwyvl]

Thanks!