feat(compliance): RHINENG-8964 allow listing/assigning policies

[xiangce]

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Complete Description of Additions/Changes:

• This is a draft re-implementation of feat(compliance): RHINENG-2077 use APIv2 for retrieving policies #4056 based on refactor: move compliance to specs.datasources #4124

[LightOfHeaven1994]

Tested it with custom egg, everything works as expected! thank you @xiangce . We will need to wait before merging this one since we haven't released APIv2 fully to prod yet

[skateman]

Thank you @xiangce, I will go through this after my PTO.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.53147% with 45 lines in your changes missing coverage. Please review.

Project coverage is 77.17%. Comparing base (d5507ad) to head (76693ad).

Files with missing lines	Patch %	Lines
...ghts/specs/datasources/compliance/compliance_ds.py	53.94%	34 Missing and 1 partial ⚠️
insights/specs/datasources/compliance/__init__.py	83.05%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4209      +/-   ##
==========================================
- Coverage   77.20%   77.17%   -0.04%     
==========================================
  Files         764      764              
  Lines       41550    41630      +80     
  Branches     8783     8789       +6     
==========================================
+ Hits        32079    32127      +48     
- Misses       8413     8442      +29     
- Partials     1058     1061       +3     

Flag	Coverage Δ
unittests	77.15% <68.53%> (-0.04%)	⬇️

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[romanblanco]

@xiangce @skateman is this ready to be merged?

[skateman]

We have performance issues...