cleanup dependencies

[ArneBinder]

• main dependencies: remove absl-py and add comments
• dev dependencies: cleanup and re-arrange
• remove uncommented pre-commit hooks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.20%. Comparing base (64335d9) to head (e60659e).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #488   +/-   ##
=======================================
  Coverage   72.20%   72.20%           
=======================================
  Files          32       32           
  Lines        2173     2173           
  Branches      316      316           
=======================================
  Hits         1569     1569           
  Misses        523      523           
  Partials       81       81           

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[RainbowRivey]

Good