Summary of Changes

• Added explicit type annotations to the PythonStructureVisitor class attributes within src/pyob/pyob_code_parser.py.
• Updated the __init__ method signature to include a None return type hint.

Technical Impact

• Improves code readability and maintainability by providing clear type definitions for internal state variables (imports, classes, functions, consts, and current_class).
• Enhances static analysis and IDE autocompletion support, reducing the likelihood of type-related bugs during future development.