feat: allow users to implement a tuning step at the function level

[denehoffman]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #61 will not alter performance

_{Comparing tunable-functions (91a3303) with main (98e6302)}

Summary

✅ 20 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.73%. Comparing base (09650b3) to head (91a3303).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   54.58%   54.73%   +0.15%     
==========================================
  Files          12       12              
  Lines        2576     2585       +9     
==========================================
+ Hits         1406     1415       +9     
  Misses       1170     1170              

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