[ty] Reject `type[Callable]` special form (#23753)
## Summary
The [typing
spec](https://typing.python.org/en/latest/spec/special-types.html) says:
> Any other [special
forms](https://typing.python.org/en/latest/spec/glossary.html#term-special-form)
like Callable are not allowed as an argument to type.
We already reject `Generic` and `TypedDict`. We should probably also
reject `Literal`. But this PR adds `Callable`.
Closes https://github.com/astral-sh/ty/issues/2964.
