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 django-cms/django-cms#7732

Update: It does not solve django-cms/django-cms#7732

Related resources

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Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@           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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