R1:bbd292b9b34e

Modernize the Herald rule search engine

Summary: Ref T13216. Update the Herald Rule SearchEngine and Query to use a more modern style.

Test Plan: Ran various rule queries in the UI, got sensible results

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13216

Differential Revision: https://secure.phabricator.com/D19803