[ENH]: Switching to official Ollama python client

[tazarov]

Description of changes

Closes #3473

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • Ollama EF now uses the official ollama python client
  • Improved tests
  • Updated docs
  • The EF now uses Chroma's default EF (all-minilm-l6-v2) as a default

Test plan

How are these changes tested?

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

Documentation Changes

Python integration example updated

[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)

[tazarov]

• [ENH]: Switching Ollama JS EF to ollama js client #2948
• [ENH]: Switching to official Ollama python client #2946 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.