Make sure we use a canonical name for all packages and references to packages in requirements

[JeanChristopheMorinPerso]

Fixes #55.

• Add tests.
• Document this package name conversion properly.
• Add a big warning in the release notes since this is a breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.57%. Comparing base (9c61a5d) to head (d14f3d3).
⚠️ Report is 71 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   77.57%   77.57%           
=======================================
  Files           8        8           
  Lines         709      709           
  Branches      147      147           
=======================================
  Hits          550      550           
  Misses        151      151           
  Partials        8        8           

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