Feature/65 actor models

[bart-maykin]

fixes #65

added the following models:

• Actor
• GeautomatiseerdeActor
• Medewerker
• OrganisatorischeEenheid

[codecov-commenter]

Codecov Report

Merging #79 (c76a686) into master (d481f5f) will increase coverage by 0.12%.
Report is 23 commits behind head on master.
The diff coverage is 97.54%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   96.15%   96.27%   +0.12%     
==========================================
  Files          99      115      +16     
  Lines        3508     3844     +336     
==========================================
+ Hits         3373     3701     +328     
- Misses        135      143       +8     

Files	Coverage Δ
...rc/openklant/components/klanten/api/serializers.py	85.71% <ø> (ø)
...enklant/components/klanten/api/tests/test_klant.py	100.00% <100.00%> (ø)
...ents/klanten/migrations/0005_auto_20230905_1215.py	100.00% <100.00%> (ø)
src/openklant/components/klanten/models/klanten.py	92.37% <100.00%> (+0.94%)	⬆️
src/openklant/components/klantinteracties/apps.py	100.00% <100.00%> (ø)
...onents/klantinteracties/migrations/0001_initial.py	100.00% <100.00%> (ø)
...s/klantinteracties/migrations/0002_klantcontact.py	100.00% <100.00%> (ø)
...nts/klantinteracties/migrations/0003_betrokkene.py	100.00% <100.00%> (ø)
.../klantinteracties/migrations/0004_digitaaladres.py	100.00% <100.00%> (ø)
...mponents/klantinteracties/migrations/0005_actor.py	100.00% <100.00%> (ø)
... and 8 more

... and 2 files with indirect coverage changes

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