Refactoring/azure/securitycenter

[misg]

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

[codecov-io]

Codecov Report

Merging #243 into refactoring/resource-configs will increase coverage by 0.2%.
The diff coverage is 43.05%.

@@                       Coverage Diff                       @@
##           refactoring/resource-configs     #243     +/-   ##
===============================================================
+ Coverage                         30.34%   30.55%   +0.2%     
===============================================================
  Files                               118      122      +4     
  Lines                              5612     5649     +37     
===============================================================
+ Hits                               1703     1726     +23     
- Misses                             3909     3923     +14

Impacted Files	Coverage Δ
...zure/resources/securitycenter/security_contacts.py	27.77% <27.77%> (ø)
...oviders/azure/resources/securitycenter/pricings.py	35.71% <35.71%> (ø)
...urces/securitycenter/auto_provisioning_settings.py	35.71% <35.71%> (ø)
ScoutSuite/providers/azure/configs/services.py	53.06% <50%> (ø)	⬆️
.../azure/resources/securitycenter/security_center.py	61.53% <61.53%> (ø)
...coutSuite/providers/azure/facade/securitycenter.py	63.63% <63.63%> (ø)
...utSuite/providers/azure/services/securitycenter.py
... and 2 more

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[Aboisier]

Looks good! We'll eventually all agree on the same conventions. haha