refactor: benchmarks tidied up

[Alhanaqtah]

Description

The tests have been finalized to use the new API (b.Loop()). Also, the dependence on b.N in determining the size of the generated data has been eliminated.

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[dkharms]

@Alhanaqtah hey! Sorry for a quite late answer.

Could you please fix issues I've left and also do following:

• fix pull request title (you can find rules in contribution guidelines);
• remove Fixes #263 line from description - I want do add new benchmarks as a part of this issue;

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.53%. Comparing base (5b4cce1) to head (02517f2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #308      +/-   ##
==========================================
- Coverage   71.61%   71.53%   -0.08%     
==========================================
  Files         204      204              
  Lines       14767    14648     -119     
==========================================
- Hits        10575    10479      -96     
+ Misses       3439     3419      -20     
+ Partials      753      750       -3     

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