Add codelyzer contextual-decorator converter#986

JoshuaKGoldberg merged 2 commits intotypescript-eslint:maintypescript-eslint/tslint-to-eslint-config:mainfrom

KingDarBoja:codelyzer-contextual-decoratorKingDarBoja/tslint-to-eslint-config:codelyzer-contextual-decoratorCopy head branch name to clipboard