Support NewType.

[BrianPugh]

@m09 can you play around with this and give feedback? I'm not experienced with NewType, so I could use some backup 😄. The actual passed in object never gets cast to the declared new-type, but I don't think that matters since static type checkers in the parenting project won't be peeking into Cyclopts.

Addresses #262.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.09%. Comparing base (17bc23e) to head (6578b73).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
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+ Coverage   94.08%   94.09%   +0.01%     
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  Files          26       26              
  Lines        2975     2981       +6     
  Branches      627      627              
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+ Hits         2799     2805       +6     
  Misses         84       84              
  Partials       92       92              

Flag	Coverage Δ
unittests	94.09% <100.00%> (+0.01%)	⬆️

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[m09]

I tried it in a few ways (newtype alone, in a union, in a list, then give it as argument to a function to see if mypy complains) and everything went perfectly fine on my 3.10 (as you suspected I didn't get warnings from mypy even though the object is not cast).

I cannot speak for other python versions but it looks very promising (and what a lightning fast PR!)

Thanks for the great work :)

[BrianPugh]

good enough for me! Other python versions are checked by the unit tests. Merging now and this will be available in v3.1.1 momentarily!