Upgrade user account activity logs to modern construction

Summary: Depends on D18965. Ref T13049. Move this Query and SearchEngine to be a little more modern, to prepare for Export support.

Test Plan:

• Used all the query fields, viewed activity logs via People and Settings.
• I'm not sure the "Session" query is used/useful and may remove it before I'm done here, but I just left it in place for now.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13049

Differential Revision: https://secure.phabricator.com/D18966