[ENH] Add nomic embedding function

[jairad26]

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • This PR adds support for the nomic embedding function in the python client
• New functionality
  • ...

Test plan

How are these changes tested?

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the docs section?

[jairad26]

• [ENH] Add nomic embedding function #4911 👈 (View in Graphite)
• [ENH] add query config on collection configuration, splade, and bm25 efs #4901
• main

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[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[propel-code-bot]

Introduce NomicEmbeddingFunction and related schema/registry updates

Adds first-class support for generating embeddings via the Nomic platform. The PR introduces a new class NomicEmbeddingFunction, its JSON configuration schema, registers the function in known_embedding_functions, updates the public __all__, and includes the new builtin in unit tests. No existing functionality is removed.

Key Changes

• New file chromadb/utils/embedding_functions/nomic_embedding_function.py implementing text and query embeddings through Nomic’s embed.text() API
• New JSON schema schemas/embedding_functions/nomic.json for config validation
• Registry updates in chromadb/utils/embedding_functions/__init__.py (imports, known_embedding_functions, __all__, builtin list)
• Test suite chromadb/test/ef/test_ef.py now expects NomicEmbeddingFunction to be present

Affected Areas

• chromadb/utils/embedding_functions module
• schemas/embedding_functions configs
• Embedding function registry and builtin list
• EF unit tests

This summary was automatically generated by @propel-code-bot

[HammadB]

Can we validate that we are using these in schema?

[HammadB]

Please see comments