Add utility function to query the plugin status from napari side

[goanpeca]

Related to #53

Napari side PR: napari/napari#6993

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.01%. Comparing base (c48deb2) to head (eb4e191).
⚠️ Report is 114 commits behind head on main.

Files with missing lines	Patch %	Lines
napari_plugin_manager/qt_plugin_dialog.py	90.90%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   92.09%   92.01%   -0.09%     
==========================================
  Files          10       10              
  Lines        1695     1740      +45     
==========================================
+ Hits         1561     1601      +40     
- Misses        134      139       +5     

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[dalthviz]

Closing as superseded by #174