Update Cell Morphology model

[GianlucaFicarelli]

Fix #121

Registration of protocols

For the registration it's possible to use any of the specific classes:

• DigitalReconstructionCellMorphologyProtocol
• ModifiedReconstructionCellMorphologyProtocol
• ComputationallySynthesizedCellMorphologyProtocol
• PlaceholderCellMorphologyProtocol

or the polymorphic class CellMorphologyProtocol, but in that case the instance should be created with CellMorphologyProtocol.model_validate() to instantiate the correct object.

EDIT: see #127 to be able to use CellMorphologyProtocol also for registration.

Retrieval of protocols

For the search and retrieval, it's possible to use the polymorphic class CellMorphologyProtocol, and the correct specific classes are automatically instantiated.

Alternatively, it would be possible to allow specifying any of the specific classes, and automatically filter the search by generation_type, but that would require some changes to the configured routes in routes.py, and it can be discussed further.

See tests and notebooks for examples.

Unrelated changes:

• add strain to subject, related to The subject schema should expose strain_id entitycore#332
• validate EMDenseReconstructionDataset.protocol_document as HttpUrl (same as in CellMorphologyProtocolBase)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
pytest	99.94% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/entitysdk/_server_schemas.py	100.00% <100.00%> (ø)
src/entitysdk/downloaders/cell_morphology.py	100.00% <100.00%> (ø)
src/entitysdk/downloaders/memodel.py	90.90% <100.00%> (ø)
src/entitysdk/models/__init__.py	100.00% <100.00%> (ø)
src/entitysdk/models/cell_morphology.py	100.00% <100.00%> (ø)
src/entitysdk/models/cell_morphology_protocol.py	100.00% <100.00%> (ø)
...ntitysdk/models/em_dense_reconstruction_dataset.py	100.00% <100.00%> (ø)
src/entitysdk/models/emodel.py	100.00% <100.00%> (ø)
src/entitysdk/models/memodel.py	100.00% <100.00%> (ø)
src/entitysdk/models/subject.py	100.00% <100.00%> (ø)
... and 3 more

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[GianlucaFicarelli]

Related: #127