Enhancement/gcp/cloudsql findings

[x4v13r64]

Update GCP Cloud SQL findings and add CIS benchmark.

[codecov-io]

Codecov Report

Merging #417 into release/5.2.0 will decrease coverage by 0.01%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##           release/5.2.0     #417      +/-   ##
=================================================
- Coverage          34.43%   34.42%   -0.02%     
=================================================
  Files                192      192              
  Lines               6343     6345       +2     
=================================================
  Hits                2184     2184              
- Misses              4159     4161       +2

Impacted Files	Coverage Δ
...iders/gcp/resources/cloudsql/database_instances.py	33.33% <0%> (-1.67%)	⬇️

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