Remove xarray-schema; validate() are now class methods

[LucaMarconato]

Closes #1065
Closes #977
Closes #528

[Copilot]

Pull request overview

This PR removes the xarray-schema dependency (addressing import failures with newer setuptools) and makes model validate() APIs consistent by moving them to class methods, while replacing raster validation with in-house checks.

Changes:

• Removed xarray-schema from dependencies and replaced raster schema validation with custom validation logic.
• Converted raster and table model validation calls to Model.validate(...) (classmethod-style) across code and tests.
• Updated raster dimension handling from model.dims.dims to model.dims.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/models/test_models.py	Updates tests to use classmethod validation and new dims representation.
tests/io/test_multi_table.py	Switches table validation call sites to TableModel.validate(...).
src/spatialdata/models/models.py	Removes xarray-schema, implements custom raster validation, converts TableModel.validate and helpers to classmethods, adds deprecation warnings for instantiation.
src/spatialdata/models/_utils.py	Updates channel-name validation to use model.dims (tuple) directly.
src/spatialdata/_utils.py	Fixes typing for dims to tuple[str, ...].
src/spatialdata/_io/io_table.py	Updates table validation to classmethod call.
src/spatialdata/_core/spatialdata.py	Updates table validation + helper validation calls to classmethod style.
src/spatialdata/_core/operations/transform.py	Uses schema.validate(...) instead of instantiating schema.
src/spatialdata/_core/operations/rasterize.py	Uses schema.validate(...) instead of instantiating schema.
src/spatialdata/_core/_elements.py	Uses classmethod validation when inserting elements.
src/spatialdata/_core/_deepcopy.py	Uses classmethod validation for multiscale raster deepcopy.
pyproject.toml	Drops xarray-schema from runtime dependencies.

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[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.89%. Comparing base (3cdf3d8) to head (45e3e33).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata/models/models.py	88.63%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1066      +/-   ##
==========================================
- Coverage   92.24%   91.89%   -0.36%     
==========================================
  Files          49       49              
  Lines        7594     7598       +4     
==========================================
- Hits         7005     6982      -23     
- Misses        589      616      +27     

Files with missing lines	Coverage Δ
src/spatialdata/_core/_deepcopy.py	98.38% <100.00%> (ø)
src/spatialdata/_core/_elements.py	92.13% <100.00%> (ø)
src/spatialdata/_core/operations/rasterize.py	90.16% <100.00%> (ø)
src/spatialdata/_core/operations/transform.py	91.37% <100.00%> (ø)
src/spatialdata/_core/spatialdata.py	91.93% <100.00%> (-0.04%)	⬇️
src/spatialdata/_io/io_table.py	90.24% <100.00%> (ø)
src/spatialdata/_utils.py	84.50% <ø> (ø)
src/spatialdata/models/_utils.py	89.20% <100.00%> (ø)
src/spatialdata/models/models.py	88.42% <88.63%> (-0.57%)	⬇️

... and 1 file with indirect coverage changes

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