add conduit method maniphest.querycomments add .arcconfig
use optional arguments and adhere to phabricator output formatting
fuggit use hardcoded query

Summary:
now has janky way to query maniphest comments by text and task status

i'm sorry i had to do this and i'm also sorry that you have to read this

Test Plan: lol this is php

Reviewers: carl, neil, carlos

Differential Revision: http://grizzly.memsql.com/D7265