ruff

fa28dc5c - [internal] Move Linter `OperatorPrecedence` into `ruff_python_ast` crate (#16162)

[internal] Move Linter `OperatorPrecedence` into `ruff_python_ast` crate (#16162) ## Summary This change begins to resolve #16071 by moving the `OperatorPrecedence` structs from the `ruff_python_linter` crate into `ruff_python_ast`. This PR also implements `precedence()` methods on the `Expr` and `ExprRef` enums. ## Test Plan Since this change mainly shifts existing logic, I didn't add any additional tests. Existing tests do pass.