Improve model for thickeners

[andrewlee94]

Fixes None

Summary/Motivation:

This PR adds an improved, predictive model for thickener/clarifiers which replaces the previous thickener model.

Changes proposed in this PR:

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[MarcusHolly]

LGTM - just a few small comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6352629) 77.39% compared to head (0a8e039) 77.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1304      +/-   ##
==========================================
+ Coverage   77.39%   77.40%   +0.01%     
==========================================
  Files         390      390              
  Lines       63547    63631      +84     
  Branches    11699    11702       +3     
==========================================
+ Hits        49182    49255      +73     
- Misses      11832    11839       +7     
- Partials     2533     2537       +4     

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[agarciadiego]

LGTM