dark console - introduce "request log" section

Summary: this section gets updated for each and every request. clicking a given entry updates the larger dark-console area to have the information from that request

Test Plan: clicked around in maniphest and observed request log populating correctly. clicked a few entries in request log and saw it updated properly. clicked a different tab in the dark-console and it worked. clicked a different request log entry and it opened the dark console to the proper request on the proper tab.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Koolvin

Maniphest Tasks: T1136

Differential Revision: https://secure.phabricator.com/D2574