[red-knot] Support `typing.get_overloads`

[dhruvmanila]

Documentation: https://docs.python.org/3/library/typing.html#typing.get_overloads

[dhruvmanila]

I think this might just be supported automatically by having generic support over Sequence and there might not be anything required to do here.

[dhruvmanila]

Yeah, there isn't anything to do here actually.