Create codeql.yml

[CM000n]

I have noticed that Github CodeQL scanning is not yet enabled for this repo.
CodeQL can help to discover vulnerabilities across a codebase: https://docs.github.com/en/code-security/code-scanning/introduction-to-code-scanning/about-code-scanning-with-codeql
This MR adds a Code QL config file to the Github workflows.

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee65802) 94.42% compared to head (772a069) 94.42%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #246   +/-   ##
=======================================
  Coverage   94.42%   94.42%           
=======================================
  Files          30       30           
  Lines        1615     1615           
=======================================
  Hits         1525     1525           
  Misses         90       90           

Flag	Coverage Δ
unittests	94.42% <ø> (ø)

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