Add first implementation of scaling functions

[franflame]

Fixes/Addresses:

#1196

Summary/Motivation:

Adding initial implementation of scaling functions for ML/AI plugin, with tests included.

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[bpaul4]

Is there code missing after this line?

[franflame]

Thanks for pointing that out, the comment was a note to revise the expected values in test_scaling.py, and the issue has been resolved.

[bpaul4]

Remove commented code, if it's not required for anything (same for other commented code in the rest of this file).

[bpaul4]

I may be misunderstanding the usage of the annotations here, but what is the outcome of this class? It seems that arrays that are transformed will raise exceptions for any input.

[franflame]

I'll add a comment to explain the purpose of the BaseScaler class; transform() and inverse_transform() should be implemented by the derived classes, so it raises an error if called from the base class.

[lbianchi-lbl]

This is affected by the Tensorflow version issues that are being worked on in #1223. This should be considered on hold until those issues have been resolved.

[codecov]

Codecov Report

Attention: Patch coverage is 90.74074% with 15 lines in your changes missing coverage. Please review.

Project coverage is 38.96%. Comparing base (691185f) to head (3d7b9f8).

Files	Patch %	Lines
foqus_lib/framework/surrogate/scaling.py	88.80%	11 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1197      +/-   ##
==========================================
+ Coverage   38.81%   38.96%   +0.14%     
==========================================
  Files         164      165       +1     
  Lines       37048    37178     +130     
  Branches     6153     6159       +6     
==========================================
+ Hits        14382    14486     +104     
- Misses      21528    21553      +25     
- Partials     1138     1139       +1     

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