fix: Add SONAR implementation and resolve missing models

[KennethEnevoldsen]

Add ModelMeta for SONAR it also ensure that an "Unknown" number of parameters is not filtered.

Should resolve:
#1979
#1976

This seems to have been caused by the restructering of calls on the leaderboard.

This however leads to the side-effect that selecting number of parameters can't remove "Unknown". A solution is to add a selection box.

@x-tabdeveloping I still can't get the SONAR model to show. I was hoping you had an idea for this?

Code Quality

• Code Formatted: Format the code using make lint to maintain consistent style.

Documentation

• Updated Documentation: Add or update documentation to reflect the changes introduced in this PR.

Testing

• New Tests Added: Write tests to cover new functionality. Validate with make test-with-coverage.
• Tests Passed: Run tests locally using make test or make test-with-coverage to ensure no existing functionality is broken.

Adding a model checklist

• I have filled out the ModelMeta object to the extent possible
• I have ensured that my model can be loaded using
  • mteb.get_model(model_name, revision) and
  • mteb.get_model_meta(model_name, revision)
• I have tested the implementation works on a representative set of tasks.