fix: return EOF token instead of raising IndexError in TokenList.get_token

[yogendra-17]

Pull Request description

TokenList.get_token() directly indexes self.tokens[self.position] without a bounds check. Calling get_next_token() past the end of the token list raises an unhandled IndexError with no source location, making it hard to debug and leaving the parser with no clean recovery path.

How to test these changes

• ...

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[xmnlab]

@yogendra-17 could you write a test for that?
in the tests it shows already the token EOF, so I am not sure if it is the way to go ... maybe there is another thing that should be fixed instead