Format type parameters on functions and classes

[konstin]

PEP 695 introduces type parameters on function and classes in python 3.12, which are currently not considered when formatting, but should be added:

class ClassA[T: str]:
    def method1(self) -> T:
        ...

def func[T](a: T, b: T) -> T:
    ...

Their implementation can likely reuse larger parts of dict comprehensions. See psf/black#3703 for the black implementation