test: implement more benchmarks

[jdrouet]

This bench is made to only test the speed of the libraries, not the capacity of the language to load files from the filesystem.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 92.73%. Comparing base (e1938f9) to head (e80d15e). Report is 13 commits behind head on main.

Files	Patch %	Lines
benchmarks/mrml-stress/src/main.rs	0.00%	21 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
- Coverage   93.06%   92.73%   -0.33%     
==========================================
  Files         227      228       +1     
  Lines       12818    12224     -594     
==========================================
- Hits        11929    11336     -593     
+ Misses        889      888       -1     

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