Add Resample and AsType

[rhoadesScholar]

Adds "Resample" node to resample arrays to a user-designated voxel size, using skimage.transform.rescale

Pre-Merge Checklist:

• [ ] if this PR adds a feature: request merge into the latest development branch (vX.Y-dev)
• [ ] if this PR fixes a bug: request merge into the latest patch branch (patch-X.Y.Z)
• [ ] PR branch name is short and describes the feature/bug addressed in this PR
• [x] commit messages are consistent
• [ ] changes reviewed by another contributor
• [x] tests cover changes
• [x] all tests pass

[rhoadesScholar]

Tests written and passed for Resample and AsType.

[rhoadesScholar]

Pull Request out of date and the main author on paternity leave until 01/17/2022. Will be splitting off updates unrelated to AsType and Resample nodes at that time into a separate pull request.

Thank you for your feedback/interest.

[pattonw]

Just a few quick changes and we can go ahead and merge: 1) Since you're adding new features can you target it at the patch-1.2.3? That will make it easier for @funkey when he eventually needs to update a new release. 2) Can you add these nodes to the docs. You can do that in the docs/build/api.rst file: https://github.com/funkey/gunpowder/blob/master/docs/build/api.rst

[rhoadesScholar]

Just a few quick changes and we can go ahead and merge:

1. Since you're adding new features can you target it at the patch-1.2.3? That will make it easier for @funkey when he eventually needs to update a new release.
2. Can you add these nodes to the docs. You can do that in the docs/build/api.rst file: https://github.com/funkey/gunpowder/blob/master/docs/build/api.rst

1. Done.
2. Added in c04f5d7, but I did not re-generate the HTML. Should I? @pattonw

[pattonw]

No need to re-generate the HTML, Jan will do that when he creates a new release. This all looks good and ready to merge