Refactoring/gcp/cloudstorage

[Remi05]

Migrated GCP Cloud Storage to the new architecture.

[codecov-io]

Codecov Report

Merging #304 into develop will increase coverage by 0.77%.
The diff coverage is 38.33%.

@@             Coverage Diff             @@
##           develop     #304      +/-   ##
===========================================
+ Coverage    34.06%   34.84%   +0.77%     
===========================================
  Files          189      188       -1     
  Lines         6246     6015     -231     
===========================================
- Hits          2128     2096      -32     
+ Misses        4118     3919     -199

Impacted Files	Coverage Δ
...te/providers/gcp/resources/cloudstorage/service.py	100% <100%> (ø)
...te/providers/gcp/resources/cloudstorage/buckets.py	25% <25%> (ø)
ScoutSuite/providers/gcp/facade/cloudstorage.py	46.66% <46.66%> (ø)
ScoutSuite/providers/gcp/configs/services.py	50% <50%> (ø)	⬆️
ScoutSuite/providers/gcp/facade/gcp.py	50% <50%> (ø)	⬆️
ScoutSuite/providers/base/configs/threads.py
ScoutSuite/providers/gcp/configs/base.py
ScoutSuite/providers/base/configs/base.py
... and 1 more

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[misg]

Good job! I just left a few comments.

[Aboisier]

Looks good overall, I left a few suggestions.

[Remi05]

I changed a few things regarding fetching of the IAM policy and the logging config so the remaining comments don't really apply anymore. Let me now what you think!

[Aboisier]

I left a few comments but looks good.

[Remi05]

Should be ready to merge, but I need to re-test it to make sure. I'm having problems with my GCP account and can't create new resources at the moment. I'll take care of it as soon as the issue with my GCP account gets resolved!

EDIT: Problem fixed!