implement LLM benchmark

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 1.66667% with 177 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.91%. Comparing base (6a55084) to head (3574b3f).

Files with missing lines	Patch %	Lines
cmd/gorse-benchmark/main.go	0.00%	177 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1129      +/-   ##
==========================================
- Coverage   71.73%   70.91%   -0.83%     
==========================================
  Files          86       87       +1     
  Lines       15171    15350     +179     
==========================================
+ Hits        10883    10885       +2     
- Misses       3215     3392     +177     
  Partials     1073     1073              

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