Allow enabling rerankers raw_scores

[rawsh]

Add raw_scores bool to reranker endpoint inputs

[greptile-apps]

PR Summary

This pull request adds a 'raw_scores' option to the reranker endpoint, allowing users to request unprocessed scores from the reranking model.

• Added 'raw_scores' boolean field to RerankInput class in /libs/infinity_emb/infinity_emb/fastapi_schemas/pymodels.py
• Implemented 'raw_scores' parameter handling in _rerank function of /libs/infinity_emb/infinity_emb/infinity_server.py
• The change allows passing 'raw_scores' directly to the engine.rerank method
• Verify that the new parameter is handled correctly throughout the reranking logic
• Ensure documentation is updated to reflect this new option for the reranker endpoint

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.67%. Comparing base (bb39cbd) to head (058d8e9).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #393   +/-   ##
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  Coverage   78.66%   78.67%           
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  Files          39       39           
  Lines        2962     2963    +1     
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+ Hits         2330     2331    +1     
  Misses        632      632           

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