Add basic search capabilities to Packages

Summary: Ref T8116. Add search-by-name and per-package / per-publisher search to Packages.

Test Plan: Searched publishers, packages, versions by name. Searched packages by publisher. Searched versions by package.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8116

Differential Revision: https://secure.phabricator.com/D16320

resources/sql/autopatches/20160722.pack.02.pkgngrams.sql

@@ -0,0 +1,7 @@
+CREATE TABLE {$NAMESPACE}_packages.packages_packagename_ngrams (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  objectID INT UNSIGNED NOT NULL,
+  ngram CHAR(3) NOT NULL COLLATE {$COLLATE_TEXT},
+  KEY `key_object` (objectID),
+  KEY `key_ngram` (ngram, objectID)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};