Add type stub file for @wrapt.decorator

[namurphy]

Description

This PR adds a type stub file for wrapt.

Motivation and context

A few of our widely used decorators like @particle_input make use of @wrapt.decorator. Because wrapt is untyped, we were running into issues with mypy not type checking some of our code because @wrapt.decorator is untyped. Adding a type stub file lets us get past that. This also serves as a prototype type stub file.

Related issues

This came up in #2429.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1c70047) 96.92% compared to head (d33475b) 96.92%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2442   +/-   ##
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  Coverage   96.92%   96.92%           
=======================================
  Files         104      104           
  Lines        9133     9153   +20     
=======================================
+ Hits         8852     8872   +20     
  Misses        281      281           

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[namurphy]

This corrects the paths to exclude when doing static type checking with mypy.

[pheuer]

Independent of the new stub file, correct?

[namurphy]

Correct, this is an independent change.

[namurphy]

All of the changes in this file made below this line were done automatically, as described in #2424.

This PR is removing a lot of the mypy errors that we had been ignoring, while also uncovering some new errors for code that wasn't type checked because it depended on @wrapt.decorator in some way.

[pheuer]

Sounds good - are there any other dependencies with the same problem/solution?

[namurphy]

Thank you for the review!

Sounds good - are there any other dependencies with the same problem/solution?

Yes. Several. The most pressing and most difficult will be astropy.units, which is being discussed in astropy/astropy#15808. I don't want to permanently add a type stub file for astropy.units here, since it would make a lot more sense to add that in Astropy itself. We might add a stub file here temporarily, if it gets added in Astropy but won't be included in a release for a while.