Annotation parser should handle FrozenSet/frozenset types

[bbopen]

Summary

parseAnnotationToPythonType and normalizeCollectionName do not recognize FrozenSet[...] or frozenset[...]. These are mapped to custom types instead of set equivalents, leading to less accurate TS types.

Evidence

• src/tywrap.ts normalizeCollectionName only matches List/Dict/Tuple/Set.
• mapSimpleName lacks FrozenSet/frozenset handling.

Proposed fix

• Extend normalizeCollectionName and mapSimpleName to include FrozenSet / frozenset and map to set/frozenset collection type.

Acceptance criteria

• FrozenSet[int] and frozenset[int] are parsed as collection types.
• TS mapping uses Set<T> (or a dedicated frozenset representation if preferred).