ucon#161: introducing UnitPackage

[withtwoemms]

closes #161

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.12195% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (8f73554) to head (ba4e5ac).

Files with missing lines	Patch %	Lines
ucon/packages.py	94.44%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   88.18%   89.17%   +0.99%     
==========================================
  Files          13       14       +1     
  Lines        2310     2392      +82     
  Branches      476      488      +12     
==========================================
+ Hits         2037     2133      +96     
+ Misses        165      152      -13     
+ Partials      108      107       -1     

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