Modernize OAuthServer PHIDs and Queries
Summary:
- Modernize PHID types.
- Implement PhabricatorPolicyInterface.
- Make queries policy aware.
Test Plan: Browsed client and authorization lists.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: chad, epriestley
Differential Revision: https://secure.phabricator.com/D8560