feat(rds): add new fixer rds_instance_no_public_access_fixer

[danibarranqueroo]

Context

Developed a new fixer that modifies the network configuration of RDS instances to ensure they are not publicly accessible, there are different ways to solve this such as restricting access to trusted IP addresses, VPCs, or specific security groups or changing the PubliclyAccessible parameter of the instance to false. As most of times the check will fail due to the last option, this is the way I'll fix it . This will enhance the security of database resources by preventing exposure to the public internet.

Description

Added new fixer rds_instance_no_public_access_fixer with its unit tests.

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 89.87%. Comparing base (3608aa3) to head (4ab2753).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5794      +/-   ##
==========================================
- Coverage   89.91%   89.87%   -0.04%     
==========================================
  Files        1128     1133       +5     
  Lines       35180    35285     +105     
==========================================
+ Hits        31631    31714      +83     
- Misses       3549     3571      +22     

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