R1:b927dc057d83

Add List/ApplicationSearch to AuthProviderConfig

Summary: Ref T1536. Adds a list controller and ApplicationSearch integration for listing providers.

Test Plan: {F46308}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1536

Differential Revision: https://secure.phabricator.com/D6198