Migrate custom types to types.py

[Andrew-S-Rosen]

Summary of Changes

Finalize movement of custom types to types.py.

FYI: @AitElBadaoui.

Requirements

• My PR is focused on a single feature addition or bugfix.
• My PR has relevant, comprehensive unit tests.
• My PR is on a custom branch (i.e. is not named main).

Notes

• Before contributing for the first time, read the "Guidelines" section.
• If you are an external contributor, you will see a comment from @buildbot-princeton. This is solely for the maintainers.
• When your code is ready for review, ping one of the active maintainers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (d227f84) to head (de499e8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2317      +/-   ##
==========================================
- Coverage   99.07%   99.06%   -0.02%     
==========================================
  Files          85       85              
  Lines        3561     3517      -44     
==========================================
- Hits         3528     3484      -44     
  Misses         33       33              

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[AitElBadaoui]

@Andrew-S-Rosen Great work! Thank you for taking the suggestion into account!