DM-35310: Modernize version determination and package setup

[timj]

Checklist

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

[codecov]

Codecov Report

Merging #111 (b64f9d7) into main (78985d2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   72.94%   72.94%           
=======================================
  Files          37       37           
  Lines        2506     2506           
  Branches      437      437           
=======================================
  Hits         1828     1828           
  Misses        609      609           
  Partials       69       69           

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[timj]

@mxk62 well the good news is that this PR passes the tests so lsst/ctrl_bps_panda#10 is still a bit of a mystery.