Add cumulative simpson integration

[f0uriest]

Resolves #9

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.20879% with 8 lines in your changes missing coverage. Please review.

Project coverage is 93.83%. Comparing base (39eafa0) to head (d52a820).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   94.33%   93.83%   -0.51%     
==========================================
  Files           7        7              
  Lines         530      616      +86     
==========================================
+ Hits          500      578      +78     
- Misses         30       38       +8     

Files	Coverage Δ
quadax/__init__.py	100.00% <100.00%> (ø)
quadax/sampled.py	88.11% <91.11%> (+1.91%)	⬆️