Add benchmark area

[treyburn]

I want a spot where I can test out data structure and algorithm choices by measuring them. The first place I've hit is for this the choice of whether to use a mutex or an atomic for our file logger sequence count.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.07%. Comparing base (832ca60) to head (c965c91).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   33.07%   33.07%           
=======================================
  Files           5        5           
  Lines         263      263           
=======================================
  Hits           87       87           
  Misses        173      173           
  Partials        3        3           

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