Add napari version update checker

[goanpeca]

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Up to date

New version available

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 110 lines in your changes missing coverage. Please review.

Project coverage is 88.19%. Comparing base (394425f) to head (a95ba61).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
napari_plugin_manager/qt_update_checker.py	0.00%	110 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (394425f) and HEAD (a95ba61). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (394425f)	HEAD (a95ba61)
	7	6

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   93.54%   88.19%   -5.36%     
==========================================
  Files          10       11       +1     
  Lines        1813     1923     +110     
==========================================
  Hits         1696     1696              
- Misses        117      227     +110     

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[jaimergp]

Continues at napari/update-checker#1