tools: add `prefer-proto` rule
If this lands, I'd be happy to refactor this rule to a prefer-syntax rule, which also checks for things like ObjectAssign with a literal as the first argument, use of Boolean(x) instead of !!x, etc.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
If this lands, I'd be happy to refactor this rule to a prefer-syntax rule, which also checks for things like ObjectAssign with a literal as the first argument, use of Boolean(x) instead of !!x, etc.