add pre commit

[jni]

• Add .pre-commit config file
• Add formatting to test_affinder

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1a60b60) 90.66% compared to head (aad8985) 90.66%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files           7        7           
  Lines         257      257           
=======================================
  Hits          233      233           
  Misses         24       24           

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