Migrate to pyproject.toml

[mraspaud]

This PR replaces setup.py with pyproject, and uses hatchling as a build system

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.78%. Comparing base (76683dc) to head (1f9b3ea).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   94.95%   94.78%   -0.18%     
==========================================
  Files          14       15       +1     
  Lines        3309     3315       +6     
==========================================
  Hits         3142     3142              
- Misses        167      173       +6     

Flag	Coverage Δ
unittests	94.78% <ø> (-0.18%)	⬇️

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