Generate expected schemata for Search

Summary:
Ref T1191. Notable:

  - Drops a very old saved query table. See comments inline: plan was to remove it after a year. It's been ~a year and two weeks.
  - This has our only fulltext index. I'm not supporting that formally for now, but left a note.
  - This has our only MyISAM table. I'm not supporting that explicitly for now, but it shouldn't affect anything. I may deal with this in the future.
  - These tables don't actually write directly via Lisk, so there's some fiddling to get the schemata right.

Test Plan: Down to ~250 warnings. No more surplus databases or tables.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10589