Refactoring/azure/keyvault

[misg]

This PR aims to migrate Azure Key Vault service to the new architecture, as part of #183.

[codecov-io]

Codecov Report

Merging #239 into refactoring/resource-configs will increase coverage by 0.29%.
The diff coverage is 46.42%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #239      +/-   ##
================================================================
+ Coverage                         29.69%   29.98%   +0.29%     
================================================================
  Files                               104      108       +4     
  Lines                              5415     5526     +111     
================================================================
+ Hits                               1608     1657      +49     
- Misses                             3807     3869      +62

Impacted Files	Coverage Δ
...e/providers/azure/resources/keyvault/key_vaults.py	36.84% <36.84%> (ø)
ScoutSuite/providers/azure/configs/services.py	53.06% <50%> (ø)	⬆️
ScoutSuite/providers/azure/facade/keyvault.py	71.42% <71.42%> (ø)
ScoutSuite/providers/aws/resources/regions.py	30.3% <0%> (-7.2%)	⬇️
ScoutSuite/providers/aws/facade/cloudtrail.py	40% <0%> (-5.46%)	⬇️
ScoutSuite/providers/aws/facade/utils.py	45% <0%> (-5%)	⬇️
ScoutSuite/providers/aws/facade/efs.py	28% <0%> (-3.58%)	⬇️
ScoutSuite/providers/aws/provider.py	10.27% <0%> (-0.03%)	⬇️
ScoutSuite/providers/azure/services/keyvault.py
...coutSuite/providers/aws/services/cloudformation.py	33.33% <0%> (ø)
... and 8 more

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[Aboisier]

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