DM-33521: Split plugins out of ctrl_bps

[mxk62]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #102 (2973b68) into main (c102962) will increase coverage by 21.71%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #102       +/-   ##
===========================================
+ Coverage   25.39%   47.11%   +21.71%     
===========================================
  Files          46       29       -17     
  Lines        3993     1974     -2019     
  Branches      713      319      -394     
===========================================
- Hits         1014      930       -84     
+ Misses       2957     1023     -1934     
+ Partials       22       21        -1     

Impacted Files	Coverage Δ
python/lsst/ctrl/bps/wms_service.py	78.87% <ø> (ø)

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[MichelleGower]

I ran tests with the HTCondor and PanDA plugins successfully. Just some minor comments/questions mostly about the documentation.