[ENH] (Cond)K-sample test using residuals

[adam2392]

Towards: #17

Changes proposed in this pull request:

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• [ ] I've updated or added any relevant docstrings following the syntax described in the Writing docstrings section of the CONTRIBUTING docs.
• [ ] If this PR fixes a bug, I've added a test that will fail without my fix.
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[codecov[bot]]

Codecov Report

Merging #20 (630e970) into main (1938c19) will decrease coverage by 6.94%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   81.73%   74.80%   -6.94%     
==========================================
  Files           8        9       +1     
  Lines         345      377      +32     
  Branches       66       70       +4     
==========================================
  Hits          282      282              
- Misses         47       79      +32     
  Partials       16       16              

Files Changed	Coverage Δ
pywhy_stats/residual.py	0.00% <0.00%> (ø)

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