🚸 Small library improvements

[burgholzer]

Description

This PR contains a couple of assorted library improvements including touch ups on the CMake config, the mypy configuration, and the pre-commit hooks.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.1%. Comparing base (1bc7998) to head (8610c9a).
Report is 109 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #686     +/-   ##
=======================================
+ Coverage   86.9%   87.1%   +0.1%     
=======================================
  Files        125     125             
  Lines      13780   13782      +2     
  Branches    2164    2164             
=======================================
+ Hits       11987   12005     +18     
+ Misses      1793    1777     -16     

Flag	Coverage Δ
cpp	86.7% <100.0%> (+0.1%)	⬆️
python	99.7% <ø> (ø)

Files with missing lines	Coverage Δ
src/circuit_optimizer/CircuitOptimizer.cpp	87.9% <100.0%> (+<0.1%)	⬆️

... and 2 files with indirect coverage changes