[#1437 #1457] Enhanced contact-form to create/update Klant, or fallback to appending contact info

[Bartvaderkin]

No description provided.

[Bartvaderkin]

@vaszig I marked as ready for review as the main commit was green and I only appended some comment cleanup

[codecov-commenter]

Codecov Report

Merging #664 (ecfc9fb) into develop (ba9e76c) will increase coverage by 0.01%.
The diff coverage is 94.27%.

@@             Coverage Diff             @@
##           develop     #664      +/-   ##
===========================================
+ Coverage    96.46%   96.47%   +0.01%     
===========================================
  Files          621      621              
  Lines        21908    22069     +161     
===========================================
+ Hits         21133    21291     +158     
- Misses         775      778       +3     

Impacted Files	Coverage Δ
src/open_inwoner/openklant/wrap.py	72.35% <57.14%> (+0.53%)	⬆️
src/open_inwoner/openklant/views/contactform.py	93.68% <89.47%> (-3.15%)	⬇️
src/open_inwoner/utils/tests/helpers.py	90.82% <92.30%> (+<0.01%)	⬆️
src/open_inwoner/openklant/forms.py	100.00% <100.00%> (ø)
src/open_inwoner/openklant/models.py	100.00% <100.00%> (ø)
src/open_inwoner/openklant/tests/data.py	100.00% <100.00%> (ø)
...c/open_inwoner/openklant/tests/test_contactform.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[vaszig]

Just a few comments but generally I don't find something weird.

[alextreme]

Discussed with @vaszig and we would like the comments to be resolved (he approved but he still had remarks open)

[Bartvaderkin]

@vaszig I appended answers and a commit with small fixes.

[vaszig]

We can merge it if tests pass.