Support editing statuses and paths in Owners via Conduit API

Summary: Ref T9964. Fixes T9752. Provides API access to enable/disable packages and change their paths.

Test Plan:

• Changed status via Conduit.
• Changed paths via Conduit.
• Tried to change a path use a nonsense/bogus repository PHID, got an error.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9752, T9964

Differential Revision: https://secure.phabricator.com/D14790