Trivially implement RepositoryEditEngine and API methods
Summary: Ref T10748. Ref T10337. This technically implements this stuff, but it does not do anything useful yet. This skips all the hard stuff.
Test Plan:
- Technically used diffusion.repository.search to get repository information.
- Technically used diffusion.repository.edit to change a repository name.
- Used editpro/ to edit a repository name.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10337, T10748
Differential Revision: https://secure.phabricator.com/D15736