✨ Add callable that returns a model as a supported model type

[zschumacher]

This PR fully implements the idea from #330 - rather than using overloads, we can simply union the model type and still infer the return type from the return type of the function when a callable is passed

[zschumacher]

closes #330

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ba8152a) to head (d2fad84).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #333   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           20        20           
  Lines          563       565    +2     
  Branches        41        41           
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+ Hits           563       565    +2     

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