auto-deploy GHA workflow

[orbeckst]

• use MDAnalysis/pypi-deployment action for automatic deployment
• external: enable trusted publishing on PyPi and TestPyPi

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.65%. Comparing base (dd787f7) to head (3a838fb).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #292   +/-   ##
========================================
  Coverage    81.65%   81.65%           
========================================
  Files           15       15           
  Lines         2017     2017           
  Branches       310      310           
========================================
  Hits          1647     1647           
  Misses         275      275           
  Partials        95       95           

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