Refactoring/aws/kms

[misg]

This PR aims to migrate private AWS KMS service to the new architecture, as part of #183. Please look at the proprietary PR as well.

[codecov-io]

Codecov Report

Merging #280 into refactoring/resource-configs will decrease coverage by <.01%.
The diff coverage is 37.5%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #280      +/-   ##
================================================================
- Coverage                         32.52%   32.51%   -0.01%     
================================================================
  Files                               149      149              
  Lines                              5617     5612       -5     
================================================================
- Hits                               1827     1825       -2     
+ Misses                             3790     3787       -3

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/facade/facade.py	44.28% <25%> (-1.31%)	⬇️
ScoutSuite/providers/aws/configs/services.py	49.18% <50%> (ø)	⬆️
ScoutSuite/output/js.py	25% <0%> (-0.36%)	⬇️

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