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141ba253 - [red-knot] Add support for `@classmethod`s (#16305)

[red-knot] Add support for `@classmethod`s (#16305) ## Summary Add support for `@classmethod`s. ```py class C: @classmethod def f(cls, x: int) -> str: return "a" reveal_type(C.f(1)) # revealed: str ``` ## Test Plan New Markdown tests