Add okverkehr integration

[axd4]

Description

Add okverkehr integration to digiwf-core

closes #670

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 22.12%. Comparing base (cfad7c0) to head (415425c). Report is 380 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #628      +/-   ##
============================================
- Coverage     22.12%   22.12%   -0.01%     
  Complexity      844      844              
============================================
  Files           592      592              
  Lines          9788     9808      +20     
  Branches        667      668       +1     
============================================
+ Hits           2166     2170       +4     
- Misses         7504     7520      +16     
  Partials        118      118              

Flag	Coverage Δ
unittests	22.12% <ø> (-0.01%)	:arrow_down:

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[StephanStrehlerCGI]

gen Ordner kann erstmal drin bleiben. Das Team von Digiwf schaut sich nochmal analog Tasklist Service.