:sparkles: [#4788] ConfigurationStep for Objects API registration config

[stevenbal]

Closes #4788 Closes #4787

TODO:

• [ ] documentation for the configsteps, this depends on the refactoring of the generate documentation functionality in django-setup-configuration (https://github.com/maykinmedia/django-setup-configuration/pull/18#discussion_r1846391053)

Depends on:

• https://github.com/maykinmedia/django-setup-configuration/pull/18
• https://github.com/maykinmedia/zgw-consumers/pull/99

Changes

• ConfigurationStep for Objects API registration config

Checklist

Check off the items that are completed or not relevant.

• Impact on features

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

• Release management

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

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

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.58%. Comparing base (77e2cd6) to head (e70f68a).

Files with missing lines	Patch %	Lines
...s/contrib/objects_api/setup_configuration/steps.py	94.73%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4822 +/- ## ======================================= Coverage 96.58% 96.58% ======================================= Files 748 750 +2 Lines 25477 25511 +34 Branches 3368 3371 +3 ======================================= + Hits 24606 24639 +33 - Misses 608 609 +1 Partials 263 263 ```

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[stevenbal]

@sergei-maertens this PR of course depends on the changes in django-setup-configuration and zgw-consumers, but I figured it would be good if you could take a look at the implementation before I start working on https://github.com/open-formulieren/open-forms/issues/4789