feat(documentdb): add new fixer documentdb_cluster_public_snapshot_fixer

[danibarranqueroo]

Context

Developed a new fixer that modifies DocumentDB cluster snapshots to restrict public accessibility, ensuring that snapshots are private and only accessible within authorized accounts or VPCs. This fixer will prevent unauthorized access to DocumentDB backups and secure sensitive data stored in snapshots.

As moto does not cover this DocumentDB API calls I needed to use Botocore for the unit tests.

Description

Added new fixer documentdb_cluster_public_snapshot_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 89.88%. Comparing base (794268c) to head (b582e81).
Report is 61 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5759    +/-   ##
========================================
  Coverage   89.87%   89.88%            
========================================
  Files        1128     1133     +5     
  Lines       35181    35285   +104     
========================================
+ Hits        31620    31715    +95     
- Misses       3561     3570     +9     

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