Migrate mypy lint to use Github Action

[jashparekh]

Summary

TODO: What does this PR do? (Replace with summary!)

Other Information

TODO (if relevant)

PR Checklist

Please run through before submitting for final review:

• The PR title is descriptive of what changed.
• The description sections above are filled out.
• The CI pipeline is passing
• Added the ready-for-review label to the PR.

[codecov]

Codecov Report

Merging #57 (005fc6b) into main (b856151) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   37.14%   37.14%           
=======================================
  Files           1        1           
  Lines          35       35           
  Branches        8        8           
=======================================
  Hits           13       13           
  Misses         21       21           
  Partials        1        1           

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