✨ [#146] added onderwerpobject filters on klantcontact endpoint

[bart-maykin]

fixes #146

added onderwerpobject filters on klantcontact:

• onderwerpobject__uuid
• onderwerpobject__url
• onderwerpobject__objectidentificator_objecttype
• onderwerpobject__objectidentificator_soort_object_id
• onderwerpobject__objectidentificator_object_id
• onderwerpobject__objectidentificator_register

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (c952db1) 96.40% compared to head (7e92d27) 96.32%.

Files	Patch %	Lines
...s/klantinteracties/api/filterset/klantcontacten.py	78.94%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   96.40%   96.32%   -0.08%     
==========================================
  Files         123      123              
  Lines        5257     5367     +110     
==========================================
+ Hits         5068     5170     +102     
- Misses        189      197       +8     

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