feat: add revision parameter to Sentence Transformers embedder components

[swapniel99]

Related Issues

None

Proposed Changes:

Added a revision parameter to all Sentence Transformers embedder components to allow users to specify a specific model revision/version from the Hugging Face Hub. This parameter is passed through to the underlying Sentence Transformers backend.

How did you test it?

• Added unit tests for all four embedder components to verify the revision parameter is correctly:
  • Initialized with default value (None)
  • Set when provided explicitly (e.g., "v1.0")
  • Serialized and deserialized in to_dict() and from_dict() methods
• Updated existing backend initialization tests to include the revision parameter
• All pre-commit hooks passed successfully

Notes for the reviewer

The revision parameter follows the same pattern as other optional parameters like trust_remote_code and local_files_only. It's passed directly to the Sentence Transformers model initialization, allowing users to pin to specific model versions for reproducibility.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

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