CI for running benchmarks

[palday]

We need to make sure our benchmark suite is up to date before merging.

We tend to do local benchmarking before big changes, but this is also a nice way to record what changes had what impact.

[codecov]

Codecov Report

Merging #594 (9a430dd) into main (d507de4) will not change coverage.
The diff coverage is n/a.

❗ Current head 9a430dd differs from pull request most recent head 5004567. Consider uploading reports for the commit 5004567 to get more accurate results

@@           Coverage Diff           @@
##             main     #594   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files          28       28           
  Lines        2523     2523           
=======================================
  Hits         2428     2428           
  Misses         95       95           

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