chore: add 'ty' job to GitHub Actions workflow for type checking

[bhimrazy]

What does this PR do?

• Briefly describe the changes.

Fixes # (issue) if any.

Checklist

• Are unit tests passing?
• Documentation added/updated for all public APIs?
• Is this a breaking change? If yes, add "[BREAKING]" to the PR title.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #297   +/-   ##
=========================================
  Coverage          ?   77.52%           
=========================================
  Files             ?       15           
  Lines             ?     2056           
  Branches          ?        0           
=========================================
  Hits              ?     1594           
  Misses            ?      462           
  Partials          ?        0           

Flag	Coverage Δ
unittests	77.52% <ø> (?)

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