Use setuptools for plugin mechanism.

[tdenewiler]

Switch from yapsy to setuptools for creating plugins for discovery, reporting, and tools.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.39%. Comparing base (c8c52c6) to head (5f81842).
Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (c8c52c6) and HEAD (5f81842). Click for more details.

HEAD has 149 uploads less than BASE

Flag	BASE (c8c52c6)	HEAD (5f81842)
	151	2

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #65       +/-   ##
============================================
- Coverage   100.00%   23.39%   -76.61%     
============================================
  Files            7        7               
  Lines          343      342        -1     
============================================
- Hits           343       80      -263     
- Misses           0      262      +262     

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