Add searchable label type widget

[simont2k]

• add custom widget for label type selection
  • searchable through using the text field
  • navigation by using arrow keys
  • selection by pressing Enter
  • dropdown can still be used with mouse only (open, scroll, select, close)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.15%. Comparing base (9f1d252) to head (c33b0a3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   88.07%   89.15%   +1.08%     
==========================================
  Files           9       10       +1     
  Lines         939     1033      +94     
==========================================
+ Hits          827      921      +94     
  Misses        112      112              

Flag	Coverage Δ
unittests	89.15% <100.00%> (+1.08%)	⬆️

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