Add benchmark tests on CI

[tlambert03]

basic benchmark regression testing using codspeed

benchmarks are taken from the interactions used in the vispy demo (but without vispy of course)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.63%. Comparing base (8e23297) to head (3325dc3).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage   94.63%   94.63%           
=======================================
  Files           9        9           
  Lines         298      298           
=======================================
  Hits          282      282           
  Misses         16       16           

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[codspeed-hq]

CodSpeed Performance Report

Merging #28 will not alter performance

_{Comparing tlambert03:bench (3325dc3) with main (1a465ed)¹}

Summary

✅ 6 untouched benchmarks

Footnotes

1. No successful run was found on main (3325dc3) during the generation of this report, so 1a465ed was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[tlambert03]

@funkey ... I'll merge this, but it's a framework and example that can be added to if you want to add more benchmarks