Add semantic analysis of type aliases and parameters (#6109)

Requires https://github.com/astral-sh/RustPython-Parser/pull/42
Related https://github.com/PyCQA/pyflakes/pull/778
[PEP-695](https://peps.python.org/pep-0695)
Part of #5062 

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->
Adds a scope for type parameters, a type parameter binding kind, and
checker visitation of type parameters in type alias statements, function
definitions, and class definitions.

A few changes were necessary to ensure correctness following the
insertion of a new scope between function and class scopes and their
parent.

## Test Plan

<!-- How was it tested? -->
Undefined name snapshots.

Unused type parameter rule will be added as follow-up.

crates/ruff_python_semantic/src/scope.rs

@@ -181,6 +181,7 @@ pub enum ScopeKind<'a> {
     AsyncFunction(&'a ast::StmtAsyncFunctionDef),
     Generator,
     Module,
+    Type,
     Lambda(&'a ast::ExprLambda),
 }