feat(opensearch): add new check opensearch_domain_master_nodes_fault_tolerant

[puchy22]

Context

Check if OpenSearch domain has at least three master nodes.

Description

• Add Master Node attributes to domain
• Test new domain attributes
• 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? No
• 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 89.16%. Comparing base (bc1e6c0) to head (af45092).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5393      +/-   ##
==========================================
- Coverage   89.18%   89.16%   -0.03%     
==========================================
  Files        1037     1038       +1     
  Lines       32004    32027      +23     
==========================================
+ Hits        28544    28556      +12     
- Misses       3460     3471      +11     

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[sergargar]

Can you change this check to be like the check opensearch_service_domains_fault_tolerant_data_nodes, please?