Handle displacement field ordering in ITK HDF5 files

[oesteban]

Summary

• detect storage order of displacement fields saved in ITK HDF5 files
• add regression tests for C- and Fortran-order displacement arrays
• improve gradient-based detection of array ordering
• add tests based on actual ITK composite file and warp
• clarify orientation tests

Testing

• pytest -c /dev/null nitransforms/tests/test_io.py::test_itk_h5_field_order nitransforms/tests/test_io.py::test_itk_h5_displacement_mismatch nitransforms/tests/test_io.py::test_itk_h5_transpose_fix nitransforms/tests/test_io.py::test_itk_h5_field_order_fortran -q

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https://chatgpt.com/codex/tasks/task_e_687dea0dc7548330968169d3f4a9a574

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.84%. Comparing base (0dff054) to head (d54c63d).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #261      +/-   ##
==========================================
- Coverage   95.22%   94.84%   -0.39%     
==========================================
  Files          16       16              
  Lines        1969     1979      +10     
  Branches      266      265       -1     
==========================================
+ Hits         1875     1877       +2     
- Misses         75       82       +7     
- Partials       19       20       +1     

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