Update BEIR scores using BGE w/ ONNX

[lintool]

• Tweaked scores by averaging over 4 trials
• Added documentation for Cohere DL19/20

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.96%. Comparing base (2ab4619) to head (6138f10).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2388   +/-   ##
=========================================
  Coverage     65.96%   65.96%           
  Complexity     1405     1405           
=========================================
  Files           207      207           
  Lines         11666    11666           
  Branches       1473     1473           
=========================================
  Hits           7695     7695           
  Misses         3461     3461           
  Partials        510      510           

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