Add @typescript-eslint/no-unnecessary-type-constraint rule

https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unnecessary-type-constraint.md

Author: sindresorhus

index.js

@@ -390,6 +390,7 @@ module.exports = {
 		'@typescript-eslint/no-unnecessary-qualifier': 'error',
 		'@typescript-eslint/no-unnecessary-type-arguments': 'error',
 		'@typescript-eslint/no-unnecessary-type-assertion': 'error',
+		'@typescript-eslint/no-unnecessary-type-constraint': 'error',
 
 		// TODO: Enable these again when we can use ESM natively in Node.js. These rules cause problems with syntax like `import x = require('x');`
 		// '@typescript-eslint/no-unsafe-assignment': 'error',