Bugfix/dendro appearance

[WeiqiNs]

Fix dendrogram plotly graph

• Removed right and top orientation.
• Added a padding so that most right leaf will not touch the border of the plot. (Note: The padding now will not go away when you zoom in and zoom out.)
• Dynamically extend plot margins so that long label will not get cut off.

Below are two usage cases.

• Left orientation
  
• Bottom orientation
  

[codecov]

Codecov Report

Merging #811 into master will increase coverage by 0.46%.
The diff coverage is 94.59%.

@@            Coverage Diff             @@
##           master     #811      +/-   ##
==========================================
+ Coverage   37.15%   37.61%   +0.46%     
==========================================
  Files          52       52              
  Lines        4288     4317      +29     
==========================================
+ Hits         1593     1624      +31     
+ Misses       2695     2693       -2

Impacted Files	Coverage Δ
lexos/models/dendro_model.py	92.85% <94.59%> (+9.93%)	⬆️

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[mleblanc321]

hmm, i'm testing DAZ and segment labels are being truncated/chopped? (using lexos3)