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aa5d665d - [ty] Add support for generic PEP695 type aliases (#20219)

[ty] Add support for generic PEP695 type aliases (#20219) ## Summary Adds support for generic PEP695 type aliases, e.g., ```python type A[T] = T reveal_type(A[int]) # A[int] ``` Resolves https://github.com/astral-sh/ty/issues/677.