🎨 [#164] changed inline uuid fields into endpoints

[bart-maykin]

Fixes #164

• added ActorKlantcontacten model and api endpoint
• added Vertegenwoordigingen model and api endpoint
• changed inline api fields (read_only)
• added unique together validation on both models and endpoints
• added validation on Vertegenwoordigingen model and endpoint so that the two fields cant be the same partij

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c952db1) 96.40% compared to head (97771d2) 96.57%.

Files	Patch %	Lines
...ant/components/klantinteracties/models/partijen.py	71.42%	4 Missing ⚠️
...lant/components/klantinteracties/models/actoren.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   96.40%   96.57%   +0.17%     
==========================================
  Files         123      124       +1     
  Lines        5257     5580     +323     
==========================================
+ Hits         5068     5389     +321     
- Misses        189      191       +2     

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