Refactoring/aws/redshift

[misg]

This PR aims to migrate AWS Redshift service to the new architecture, as part of #183.

[codecov-io]

Codecov Report

Merging #261 into refactoring/resource-configs will increase coverage by 0.23%.
The diff coverage is 48.93%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #261      +/-   ##
================================================================
+ Coverage                         30.49%   30.72%   +0.23%     
================================================================
  Files                               120      126       +6     
  Lines                              5542     5601      +59     
================================================================
+ Hits                               1690     1721      +31     
- Misses                             3852     3880      +28

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/facade/facade.py	35.84% <33.33%> (-1.41%)	⬇️
...Suite/providers/aws/resources/redshift/clusters.py	36.36% <36.36%> (ø)
.../aws/resources/redshift/cluster_security_groups.py	36.36% <36.36%> (ø)
...iders/aws/resources/redshift/cluster_parameters.py	40% <40%> (ø)
...aws/resources/redshift/cluster_parameter_groups.py	43.75% <43.75%> (ø)
ScoutSuite/providers/aws/facade/redshift.py	48.14% <48.14%> (ø)
ScoutSuite/providers/aws/configs/services.py	49.18% <50%> (ø)	⬆️
...coutSuite/providers/aws/resources/redshift/vpcs.py	83.33% <83.33%> (ø)
...tSuite/providers/aws/resources/redshift/service.py	87.5% <87.5%> (ø)
... and 6 more

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[Aboisier]

🥇 Good stuff!