fix: fix annotated in get_widget_class

[tlambert03]

fixes #478, adding support for Annotated[...] types directly in get_widget_class

[codecov]

Codecov Report

Base: 89.90% // Head: 89.90% // No change to project coverage 👍

Coverage data is based on head (08fb6cd) compared to base (52e0f26).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #525   +/-   ##
=======================================
  Coverage   89.90%   89.90%           
=======================================
  Files          38       38           
  Lines        4437     4437           
=======================================
  Hits         3989     3989           
  Misses        448      448           

Impacted Files	Coverage Δ
src/magicgui/widgets/bases/_widget.py	87.87% <ø> (+0.44%)	⬆️
src/magicgui/signature.py	96.25% <100.00%> (-0.38%)	⬇️
src/magicgui/type_map/_type_map.py	96.69% <100.00%> (+0.16%)	⬆️
src/magicgui/widgets/bases/_create_widget.py	93.93% <0.00%> (-3.04%)	⬇️

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