Conpherence - add querytransaction method

Summary: Ref T3166. Returned all the data I could think of, though notable "metadata" isn't used in conpherence (yet afaik) AND its somewhat silly to return the conpherence id / phid you specified, but seems handy.

Test Plan: played with conduit console.

Reviewers: epriestley

Reviewed By: epriestley

CC: chad, aran, Korvin

Maniphest Tasks: T3166

Differential Revision: https://secure.phabricator.com/D6098