add waterfall color config for waterfall plot

[CloseChoice]

Overview

Closes #3266

Description of the changes proposed in this pull request:

Checklist

• All pre-commit checks pass.
• Unit tests added (if fixing a bug or adding a new feature)

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b99ab20) 58.18% compared to head (6c7093b) 58.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3377      +/-   ##
==========================================
+ Coverage   58.18%   58.25%   +0.07%     
==========================================
  Files          89       89              
  Lines       12564    12588      +24     
==========================================
+ Hits         7310     7333      +23     
- Misses       5254     5255       +1     

Files	Coverage Δ
shap/plots/__init__.py	90.00% <100.00%> (ø)
shap/plots/_waterfall.py	86.76% <96.77%> (+0.68%)	⬆️

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[CloseChoice]

@thatlittleboy @connortann Some time passed since I opened this PR. Do you have time to look at this?

[connortann]

I've been away recently but back around now, so I'll have some time this week to have a proper look. From a brief read this looks great, but I'd like to give a proper review and think about design choices. This will be a great feature to include.

[CloseChoice]

I've been away recently but back around now, so I'll have some time this week to have a proper look. From a brief read this looks great, but I'd like to give a proper review and think about design choices. This will be a great feature to include.

Please note that IF we add this, we should probably use this pattern in the other plotting functions aswell. So that we have one dataclass for each plotting function and then we could generalize from there since all configuration options will be visible in the dataclasses.

[connortann]

I think we should discuss the design choices and make a rough plan; I'd like to run some ideas past you. I'm not sure that a dataclass is the best way to proceed. I'll comment on the issue tracker over at #3266 ...