feat(neptune): add new fixer neptune_cluster_public_snapshot_fixer

[danibarranqueroo]

Context

Developed a new fixer that modifies the snapshot settings of Neptune clusters to ensure they are private and not publicly accessible. This will help prevent unauthorized access to database snapshots, enhancing the security of stored data and reducing the risk of data leaks.

For the unit tests, moto does not work well with Neptune so I had to use Botocore.

Description

Added new fixer neptune_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 89.89%. Comparing base (f3cfaca) to head (befe49d).
Report is 25 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5749    +/-   ##
========================================
  Coverage   89.89%   89.89%            
========================================
  Files        1128     1133     +5     
  Lines       35182    35285   +103     
========================================
+ Hits        31628    31721    +93     
- Misses       3554     3564    +10     

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