Refactoring/aws/cloudformation

[Aboisier]

This PR migrates CloudFormation to the new architecture (see #183 ).

[codecov-io]

Codecov Report

Merging #216 into refactoring/resource-configs will increase coverage by 0.04%.
The diff coverage is 38%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #216      +/-   ##
================================================================
+ Coverage                         29.63%   29.67%   +0.04%     
================================================================
  Files                               100      101       +1     
  Lines                              5312     5334      +22     
================================================================
+ Hits                               1574     1583       +9     
- Misses                             3738     3751      +13

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/facade/facade.py	66.66% <100%> (+3.03%)	⬆️
ScoutSuite/providers/aws/facade/cloudformation.py	31.57% <31.57%> (ø)
.../providers/aws/resources/cloudformation/service.py	36% <36%> (ø)
...uite/providers/aws/resources/cloudtrail/service.py	26.08% <50%> (ø)	⬆️
ScoutSuite/providers/aws/configs/services.py	49.18% <50%> (ø)	⬆️

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[Remi05]

Looks good!

[vifor2]

Neato benito 👌

[misg]

Good job! Although, same thing as your others PRs: we need to make cloudformation facade async (see #224 for context and details), so I also left a couple of suggestions to do so.