User extension API revision, adding to GOC3 model

[SanjayJohnson02]

Changes to user extension

[SanjayJohnson02]

dont merge yet

[sshin23]

Any particular reason we don't do this for goc3 models?

[SanjayJohnson02]

Any particular reason we don't do this for goc3 models?

not particularly, i can add it later, will open an issue

[sshin23]

I'd suggest we do this in this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.92%. Comparing base (645f9b7) to head (521496a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   88.80%   88.92%   +0.12%     
==========================================
  Files           8        8              
  Lines        1268     1282      +14     
==========================================
+ Hits         1126     1140      +14     
  Misses        142      142              

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[SanjayJohnson02]

I'd suggest we do this in this PR

these changes have been added now, pr should be ready to merge