Add a linter rule for useless overriding methods
Summary: Ref T7409. Adds ArcanistXHPASTLinter::LINT_USELESS_OVERRIDING_METHOD for detecting method which only call their parent method. Based on Generic_Sniffs_CodeAnalysis_UselessOverridingMethodSniff.
Test Plan: Added unit tests.
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T7409
Differential Revision: https://secure.phabricator.com/D12419