Add diffusion.uri.edit for creating and editing repository URIs
Summary: Ref T10748. Brings the rest of the transactions to EditEngine, supports creating via API.
Test Plan:
- Created a URI via API.
- Created a URI via web.
- Tried to apply sneaky transactions, got rejected with good error messages. <_< >_>
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10748
Differential Revision: https://secure.phabricator.com/D15821