Detect permutations in redundant open modes (#14255)

## Summary

Closes https://github.com/astral-sh/ruff/issues/14235.

crates/ruff_python_stdlib/src/lib.rs

@@ -3,6 +3,7 @@ pub mod future;
 pub mod identifiers;
 pub mod keyword;
 pub mod logging;
+pub mod open_mode;
 pub mod path;
 pub mod str;
 pub mod sys;