Replace isort and black with ruff

[m-reuter]

Ruff is a fast alternative which we used anyway. Now I select more checks to replace isort and black to simplify things.

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 16 lines in your changes missing coverage. Please review.

Project coverage is 6.96%. Comparing base (094a616) to head (89b988e).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
whippersnappy/core.py	0.00%	8 Missing ⚠️
whippersnappy/read_geometry.py	0.00%	7 Missing ⚠️
whippersnappy/config_app.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #38   +/-   ##
=====================================
  Coverage   6.96%   6.96%           
=====================================
  Files          5       5           
  Lines        632     632           
  Branches      77      79    +2     
=====================================
  Hits          44      44           
  Misses       585     585           
  Partials       3       3           

Flag	Coverage Δ
unittests	6.96% <11.11%> (ø)

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