chore: Add python compile cache to gitignore

[ivirshup]

Reason for Change

Very minor PR. Just noticed that __pycache__ directories were showing up as untracked when I was playing around with the package, and these are normally included in .gitignores so they don't get committed by mistake.

Changes

• add some lines to .gitignore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.01%. Comparing base (2f1b91b) to head (d7c6746).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #253   +/-   ##
=======================================
  Coverage   89.01%   89.01%           
=======================================
  Files          19       19           
  Lines        1274     1274           
  Branches      110      110           
=======================================
  Hits         1134     1134           
  Misses        122      122           
  Partials       18       18           

Flag	Coverage Δ
unittests	89.01% <ø> (ø)

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