[WIP] Add hybrid diversity support

[trengrj]

• Add hybrid support for search diversity / MMR

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.56%. Comparing base (95b5d76) to head (48c78a8).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
integration/test_collection_diversity_hybrid.py	61.53%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2079      +/-   ##
==========================================
- Coverage   86.64%   86.56%   -0.09%     
==========================================
  Files         300      302       +2     
  Lines       23172    23234      +62     
==========================================
+ Hits        20077    20112      +35     
- Misses       3095     3122      +27     

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