WIP: Quick POC for #2823

[atodorov]

Upstream todo:

• Enable testing with GitHub Actions in django-tabular-permissions
• Add tests for their Demo app, make sure that it works with latest Django
• Fix anything that needs fixing

Then:

• Extend django-tabular-permissions to display additional text from apps/models. For AppConfig we can use doc-string or custom attribute. For models we can only use doc-string b/c it seems custom attributes on the Meta class aren't suported! Nor is a Meta doc-string!

Then:

• Update to the appropriate django-tabular-permissions version and
• Document each app & model

Also TODO:

• Some models aren't needed, filter them out of the query set
• Do the same for TenantGroup model