R1:08a19f35f07c

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