Enable Group creation via API on GitLab.com for Admins
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### Proposal
Enable group creation via API on GitLab.com specifically for Admins only.
The desired end result is that GitLab.com admins can create top-level groups through both the UI and API, without changing the current state with allowing users to create top-level groups through the UI.
This would enable automation of creation of internal groups for team members.
issue