Show progress bar in SentenceTransformer

[raffaem]

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • ...
• 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?

[github-actions]

Reviewer Checklist

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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?
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Quality

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[propel-code-bot]

This PR introduces an optional show_progress_bar argument to the SentenceTransformerEmbeddingFunction class, allowing users to enable a progress bar during embedding generation. The argument is added to the constructor, documented in the docstring, stored as a class property, and passed to the underlying model's encode method.

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