ENH: allow weighting by a custom principal component

[martinfleis]

Closes #28

[codecov-commenter]

Codecov Report

Base: 81.02% // Head: 80.64% // Decreases project coverage by -0.37% ⚠️

Coverage data is based on head (4045c5b) compared to base (f6408bd).
Patch coverage: 64.51% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   81.02%   80.64%   -0.38%     
==========================================
  Files           2        2              
  Lines         332      341       +9     
==========================================
+ Hits          269      275       +6     
- Misses         63       66       +3     

Impacted Files	Coverage Δ
clustergram/clustergram.py	80.23% <64.51%> (-0.38%)	⬇️

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