add python parsing capabilities - #37

This pull request includes significant updates to the src/context/language/python-parser.ts file, focusing on implementing methods for parsing Python files and determining the largest enclosing context. The changes introduce a new parser, a custom listener for AST traversal, and robust error handling.

Key changes include:

Implementation of Python Parsing Methods:

• Introduction of Python3Parser: Added import and instantiation of Python3Parser to parse Python files.
• Implementation of findEnclosingContext Method: Created a method to find the largest enclosing context in a Python file by traversing the AST with a custom listener.
• Implementation of dryRun Method: Added a method to validate Python files by parsing them and handling any parsing errors.

Helper Functions:

• processNode Function: Added a helper function to process each AST node and determine if it is the largest enclosing context.