Add CI workflow for running benchmarks

[lola831]

Description

This PR introduces a new GitHub Actions workflow (.github/workflows/run-benchmarks.yml) that runs benchmarks via an issue comment trigger. It verifies that the commenter has sufficient permissions, checks out both the base branch and compare branch (using the merge ref if available), runs benchmarks from tools/benchmarking/ci/benchmarks.py, compares the results with pyperf, and posts the comparison back to the PR comment.

Issue Link

N/A

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.35%. Comparing base (b72430c) to head (e835725).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #341   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files          54       54           
  Lines       13584    13584           
=======================================
+ Hits        12409    12410    +1     
+ Misses       1175     1174    -1     

see 4 files with indirect coverage changes

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