fix: allow indexed_field is none for image datasets with create_index

[zanussbaum]

when using add_data with the create_index flow, we need to allow a None for indexed_field and default to a fixed value for now for native image datasets

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🚀	This description was created by Ellipsis for commit cde7192

Summary:

Allow None for indexed_field in image datasets, defaulting to _blob_hash, and update version to 3.0.38.

Key points:

• Allow None for indexed_field in image datasets, defaulting to _blob_hash.
• Update version to 3.0.38.
• Updated examples/image/map_cifar10.py to remove unused import and add data parameter in atlas.map_data call.
• Modified nomic/dataset.py::AtlasDataset::create_index:
  • Set indexed_field to _blob_hash for image datasets if indexed_field is None.
  • Log a warning if indexed_field is not None for image datasets.
• Modified nomic/atlas.py::map_data to allow None for indexed_field in image datasets, defaulting to _blob_hash.
• Updated version in setup.py from 3.0.36 to 3.0.38.

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[ellipsis-dev]

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[AndriyMulyar]

approved but commits are failing

[ellipsis-dev]

❌ Changes requested. Incremental review on cde7192 in 1 minute and 8 seconds

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