Mixer Scaler

[dallan-keylogic]

Summary/Motivation:

Scaler object for the mixer unit model. Depends on #1673.

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
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[codecov]

Codecov Report

❌ Patch coverage is 91.62304% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.17%. Comparing base (42e8728) to head (168b55d).

Files with missing lines	Patch %	Lines
idaes/core/base/control_volume_base.py	87.67%	8 Missing and 1 partial ⚠️
idaes/models/unit_models/mixer.py	82.92%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           scaling_toolbox    #1676      +/-   ##
===================================================
+ Coverage            77.11%   77.17%   +0.05%     
===================================================
  Files                  395      395              
  Lines                63727    63885     +158     
  Branches             10555    10615      +60     
===================================================
+ Hits                 49145    49305     +160     
- Misses               12079    12081       +2     
+ Partials              2503     2499       -4     

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