Feature/support consumer 20x responses

[stevenbal]

No description provided.

[codecov-commenter]

Codecov Report

Merging #118 (e9abc69) into master (c1c0b29) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   90.21%   90.26%   +0.05%     
==========================================
  Files          87       87              
  Lines        2309     2322      +13     
  Branches      219      220       +1     
==========================================
+ Hits         2083     2096      +13     
  Misses        207      207              
  Partials       19       19              

Impacted Files	Coverage Δ
src/nrc/api/tests/test_validation.py	100.00% <100.00%> (ø)
src/nrc/api/validators.py	77.27% <100.00%> (ø)

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[joeribekker]

Original feature in: open-zaak/open-notificaties#72