pyright -> mypy

[tlambert03]

Moving from pyright type checking to mypy.

[codecov]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #11   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files           2        2           
  Lines         352      352           
=======================================
  Hits          348      348           
  Misses          4        4           

Impacted Files	Coverage Δ
magicgui/_qt.py	98.16% <100.00%> (ø)
magicgui/core.py	99.17% <100.00%> (ø)

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