ENH: support interactive bokeh plots

[martinfleis]

Adds Clustergram.bokeh() method which generates clustergram in a form of internactive bokeh plot. On top of an ability to zoom to specific sections shows the count of observations and cluster label (linked to Clustergram.labels).

To-do:

• documentation
• check RAPIDS compatibility

I think I'll need to split docs into muliple pages at this point.

[codecov-commenter]

Codecov Report

Merging #14 (05bf116) into main (da3b159) will increase coverage by 3.00%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   59.81%   62.81%   +3.00%     
==========================================
  Files           3        3              
  Lines         535      597      +62     
==========================================
+ Hits          320      375      +55     
- Misses        215      222       +7     

Impacted Files	Coverage Δ
clustergram/clustergram.py	81.08% <87.50%> (+1.88%)	⬆️

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