fix: Create missing __init__.py in management folder

[fsbraun]

Description

Django does not recognize djangocms_versioning's management command create_versions which creates missing version objects for versioned objects, e.g., after adding djangocms_versioning to project at a later stage.

It might be a candidate to support fixing https://github.com/django-cms/django-cms/issues/7732

Update: It does not solve https://github.com/django-cms/django-cms/issues/7732

Related resources

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Checklist

• [x] I have opened this pull request against master
• [x] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (08c48a5) 90.88% compared to head (a1c975c) 90.88%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #366 +/- ## ======================================= Coverage 90.88% 90.88% ======================================= Files 72 72 Lines 2546 2546 Branches 361 361 ======================================= Hits 2314 2314 Misses 168 168 Partials 64 64 ```

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