ci: add test-mypy.yaml

[zen-xu]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (afbc02a) to head (5ce45c2).

❗ Current head 5ce45c2 differs from pull request most recent head f39858b. Consider uploading reports for the commit f39858b to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          213       213           
  Branches        15        15           
=========================================
  Hits           213       213           

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