feat(azure): check for minimal TLS version for Azure SQL server

[johannes-engler-mw]

Context

Verify a secure configuration of SQL servers in Azure

Description

New check for minimum required TLS version of Azure SQL servers.

Checklist

• Are there new checks included in this PR? Yes
  • If so, do we need to update permissions for the provider? Please review this carefully. -> 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 89.86%. Comparing base (5641160) to head (f85a9ce).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5745      +/-   ##
==========================================
+ Coverage   89.83%   89.86%   +0.02%     
==========================================
  Files        1128     1129       +1     
  Lines       35154    35173      +19     
==========================================
+ Hits        31582    31609      +27     
+ Misses       3572     3564       -8     

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