R1:767528c0ed55

Move search query parser/compiler classes to Phabricator

Summary: Ref T13472. Ref T13395. These classes are only used by Phabricator and not likely to find much use in Arcanist.

Test Plan: Grepped libphutil and Arcanist for removed symbols.

Maniphest Tasks: T13472, T13395

Differential Revision: https://secure.phabricator.com/D20939