feat(apigateway): add new check apigateway_restapi_tracing_enabled

[danibarranqueroo]

Context

This control ensures that AWS X-Ray tracing is enabled for Amazon API Gateway REST API stages. Enabling X-Ray helps you analyze and debug your API by providing insights into the requests that pass through your API Gateway, including performance bottlenecks and errors.

Description

Added new check apigateway_restapi_tracing_enabled 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 89.60%. Comparing base (415c319) to head (ea26982).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5470      +/-   ##
==========================================
+ Coverage   89.57%   89.60%   +0.02%     
==========================================
  Files        1068     1069       +1     
  Lines       33109    33133      +24     
==========================================
+ Hits        29658    29688      +30     
+ Misses       3451     3445       -6     

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