Add pre commit integration

[UnknownPlatypus]

Fixes #83

This adds basic pre-commit hooks and also does an initial pre-commit run --all-files to fix existing violations (mostly some incorrect end of files)

To enable the automatic CI runs, You'll have to do the necessary setup here. This is free for open source use.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.71%. Comparing base (1c1cdec) to head (651beb1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files          45       45           
  Lines        7787     7787           
  Branches     2792     2792           
=======================================
  Hits         7687     7687           
  Misses         65       65           
  Partials       35       35           

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[LilyAcorn]

Thanks for this!

If we can avoid breaking the contents of the invalid.txt test template, I'm happy to merge this.