R1:3ba56ceaf0f0

Add an anyone() typeahead function for matching any document owner

Summary: Fixes T5733.

Test Plan: Ran search and Maniphest queries.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5733

Differential Revision: https://secure.phabricator.com/D12535