feat: custom attributes

[meenzen]

See https://admin-docs.zammad.org/en/latest/system/objects.html

[github-actions]

Test Results

58 tests  +2   57 ✅ +2   14s ⏱️ ±0s
 2 suites ±0    1 💤 ±0 
 2 files   ±0    0 ❌ ±0 

Results for commit e3e2540. ± Comparison against base commit 6915461.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.17%. Comparing base (6915461) to head (e3e2540).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   43.17%   43.17%           
=======================================
  Files          24       24           
  Lines         498      498           
  Branches       31       31           
=======================================
  Hits          215      215           
  Misses        268      268           
  Partials       15       15           

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