Models for the new version of the api

[bart-maykin]

Fixes #61 #62 #63 #64 #65 #66

Changes:

• added klantinteractie folder in components
• added new models with migrations

[codecov-commenter]

Codecov Report

Merging #90 (bdde749) into master (d481f5f) will increase coverage by 0.10%.
Report is 23 commits behind head on master.
The diff coverage is 97.39%.

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   96.15%   96.26%   +0.10%     
==========================================
  Files          99      112      +13     
  Lines        3508     3825     +317     
==========================================
+ Hits         3373     3682     +309     
- 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)
...ant/components/klantinteracties/models/__init__.py	100.00% <100.00%> (ø)
...nt/components/klantinteracties/models/constants.py	100.00% <100.00%> (ø)
...components/klantinteracties/models/internetaken.py	100.00% <100.00%> (ø)
...mponents/klantinteracties/models/klantcontacten.py	100.00% <100.00%> (ø)
... and 5 more

... and 2 files with indirect coverage changes

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