Add a linter rule for parentheses being used with PHP language constructs

Summary: Fixes T5648.

Test Plan: Added some test cases.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5648

Differential Revision: https://secure.phabricator.com/D10122