Improve the declaration parentheses linting

Summary: Improve ArcanistClosingDeclarationParenthesesXHPASTLinterRule (and rename it to ArcanistDeclarationParenthesesXHPASTLinterRule) to ensure that there is no whitespace before the opening parenthesis of a function/method declaration.

Test Plan: Added test cases.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13675