Add benchmarks

[mattcieslak]

Adds documentation about the benchmarks and will add plots (once the benchmarks finish running)

[codecov]

Codecov Report

❌ Patch coverage is 26.02740% with 378 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.44%. Comparing base (387ab5c) to head (5ce0fb1).

Files with missing lines	Patch %	Lines
include/trx/trx.tpp	27.12%	223 Missing ⚠️
src/trx.cpp	12.06%	153 Missing ⚠️
include/trx/trx.h	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   84.03%   78.44%   -5.60%     
==========================================
  Files          13       13              
  Lines        4724     5181     +457     
  Branches      726      840     +114     
==========================================
+ Hits         3970     4064      +94     
- Misses        754     1117     +363     

Flag	Coverage Δ
linux	78.65% <26.52%> (-5.46%)	⬇️
macos	78.31% <26.02%> (-5.62%)	⬇️

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