[#4418] Add addressNl specific mappings to Objects API registration (variables tab)

[vaszig]

Closes #4418 partly

Changes

This PR handles the frontend part of the task

• Added specific addressNL fields/mappings to the Objects API registration
• Added stories

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.56%. Comparing base (961e607) to head (1aae8d5).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4751      +/-   ##
==========================================
- Coverage   96.56%   96.56%   -0.01%     
==========================================
  Files         746      746              
  Lines       25185    25191       +6     
  Branches     3312     3313       +1     
==========================================
+ Hits        24320    24325       +5     
- Misses        601      602       +1     
  Partials      264      264              

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