Versioning, packaging and continuous deployment on PyPI

[HealthyPear]

• Merge PR Prepare first upload to PyPI #107
• Merge PR Update DOIs after latest release #109
• make sure versioning works correctly
• make sure CD works correctly (tested from branch test_maintenance-versioning, since this cannot be performed from a PR - GitHub secrets are not passed from forks)
• make sure pip package for released version is installed correctly from PyPI
• check development installation
  • tests
  • update docs

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[codecov]

Codecov Report

Merging #105 (16e0177) into master (ee76a29) will increase coverage by 0.23%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   39.00%   39.23%   +0.23%     
==========================================
  Files          20       22       +2     
  Lines        1841     1858      +17     
==========================================
+ Hits          718      729      +11     
- Misses       1123     1129       +6     

Impacted Files	Coverage Δ
protopipe/version.py	54.54% <54.54%> (ø)
protopipe/_dev_version.py	80.00% <80.00%> (ø)
protopipe/__init__.py	100.00% <100.00%> (ø)

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