Multiple Python TSG grammar scoping errors

[Lexxxzy]

Current Python TSG grammar has several scoping issues that prevent files from being indexed, specifically:

• Using keyword arguments in a class’s base list (e.g., class Parts(TypedDict, total=False):) triggers an Undefined scoped variable … keyword_argument.output error.
• Typed splat parameters (e.g., **_kwargs: str, *args: Any) result in an Undefined scoped variable … dictionary_splat_pattern.def error.
• Chained assignments (e.g., a = b = 1) raise an Undefined scoped variable … syntax node assignment error.
• Parameterless lambdas (e.g., dataclasses.field(default_factory=lambda: [0])) lead to an Undefined scoped variable [syntax node lambda] error.

These errors results in a fatal failure, preventing the affected files from being indexed

[CleanCut]

The github/stack-graphs repository is no longer being maintained. As per #502, I'm closing all issues and pull requests before archiving the repository.