Improve consistent initial conditions

[JonasBreuling]

Fix a small bug in the computation of consistent initial conditions and cleanup the entire code. Resolves #35.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.23%. Comparing base (d658190) to head (25cbb48).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scipy_dae/integrate/_dae/common.py	91.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   81.19%   81.23%   +0.03%     
==========================================
  Files          17       17              
  Lines        1505     1508       +3     
==========================================
+ Hits         1222     1225       +3     
  Misses        283      283              

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