Implement Ranged on more structs (#6639)

## Summary

I noticed some inconsistencies around uses of `.range.start()`, structs
that have a `TextRange` field but don't implement `Ranged`, etc.

## Test Plan

`cargo test`

crates/ruff_python_parser/src/function.rs

@@ -66,7 +66,7 @@ pub(crate) fn validate_pos_params(
     if let Some(invalid) = first_invalid {
         return Err(LexicalError {
             error: LexicalErrorType::DefaultArgumentError,
-            location: invalid.parameter.range.start(),
+            location: invalid.parameter.start(),
         });
     }
     Ok(())