feat(codebuild): add new check codebuild_report_group_export_encrypted

[puchy22]

Context

Checks if CodeBuild report group exports are encrypted at rest.

Description

• Add report_groups to CodeBuild
• Add ReportGroup and ExportConfig model
• Test report_groups
• Add check logic
• Add unit testing for the check

Checklist

• Are there new checks included in this PR? Yes
  • If so, do we need to update permissions for the provider? Yes, codebuild:ListReportGroups is needed, I added to policy.
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.22%. Comparing base (aac6038) to head (14c43a1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...viders/aws/services/codebuild/codebuild_service.py	94.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5384      +/-   ##
==========================================
+ Coverage   89.20%   89.22%   +0.01%     
==========================================
  Files        1038     1039       +1     
  Lines       32033    32089      +56     
==========================================
+ Hits        28576    28632      +56     
  Misses       3457     3457              

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