[refactor] Centralizing custom Python types

[john-bodley]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

This PR centralizes the custom Python types into the recently created superset.typing module.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

to: @etr2460

[codecov-io]

Codecov Report

Merging #9026 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9026   +/-   ##
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  Coverage   59.15%   59.15%           
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  Files         367      367           
  Lines       11686    11686           
  Branches     2866     2866           
=======================================
  Hits         6913     6913           
  Misses       4594     4594           
  Partials      179      179

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[villebro]

Good initiative to centralize these further.