[WIP] [Feature]: Add class

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Implement class for this language. It should support class member and method. The syntax should be as follows:

Class <class_name>:
    Algorithm new(self):
        self.x <- 0
        self.y <- 0

Fixes #1.

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[mtmatt]

What's your plan?