ci: add codeql

[baerwang]

What this PR does:

Which issue(s) this PR fixes:

Fixes #620

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4330268) 37.28% compared to head (94293de) 37.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #621   +/-   ##
=======================================
  Coverage   37.28%   37.28%           
=======================================
  Files         175      175           
  Lines       11666    11666           
=======================================
  Hits         4350     4350           
  Misses       6952     6952           
  Partials      364      364           

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