Add benchmarks to CI runs

[mborland]

Begins: #2

Runs the benchmarks in the CI when NDEBUG is defined so that we can get a bunch of native results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.59%. Comparing base (7d800ff) to head (63298e0).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   96.57%   96.59%   +0.02%     
==========================================
  Files           2        3       +1     
  Lines         292      294       +2     
  Branches       33       33              
==========================================
+ Hits          282      284       +2     
  Misses         10       10              

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