Add affine transformations of the Shape model

[Yu-AnChen]

Description

Support AffineTransform model in Shape's transform property. This feature was introduced in OMERO 5.3, details can be found in this OME blog post.

I utilize the transform property to transfer ROIs between images of the same sample, which were captured using different microscopes or magnifications.

Checklist

• Docstrings for all functions
• Unit tests
• Clean style in the spirit of PEP8

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.

[Yu-AnChen]

Thanks for making ezomero, it's super helpful! Please advise this PR and feel free to make any changes :)

[erickmartins]

Thanks for the PR! I'll try to have a closer look at it next week.

[erickmartins]

a few notes:

1. in rois.py, the transform field should be in each individual ROI type - not on the ezShape dataclass. I think tests are currently failing because of that;
2. please add a test case using the new transform field for each shape in tests/test_rois.py;
3. please add transforms into the shapes created in roi_fixture at tests/conftest.py.

Once more, thanks for the contribution!

[Yu-AnChen]

Thank you! I'll work on it soon :)