python(feat): add HDF5 schema detection

[wei-qlu]

Summary

• Adds Hdf5Schema enum (ONE_D, TWO_D, COMPOUND) and a required hdf5_schema parameter on import_from_path and detect_config.
• Implements per-schema detection in _internal/util/hdf5.py, datasets that don't fit the chosen schema are not included.

Test plan

• Imported a test HDF5 file under each schema (ONE_D, TWO_D, COMPOUND); imports completed and channels matched expectations
• Confirmed import_from_path("file.h5", ...) without hdf5_schema raises a clear ValueError
• Unit tests cover each schema's happy path, filter behavior, and the shared primitives

[github-actions]

Python docs preview: https://sift-stack.github.io/sift/python/pr-593/

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