Add a simple benchmark

[svchb]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.37%. Comparing base (c565f67) to head (f33fc38).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #611      +/-   ##
==========================================
- Coverage   69.92%   69.37%   -0.55%     
==========================================
  Files          86       85       -1     
  Lines        5120     5124       +4     
==========================================
- Hits         3580     3555      -25     
- Misses       1540     1569      +29     

Flag	Coverage Δ
unit	69.37% <ø> (-0.55%)	⬇️

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[svchb]

TODO: Use benmarkpkg instead and simplify bash script