Less restrictive Parameters<T> and ReturnType<T>

[ahejlsberg]

This PR changes the constraints of the predefined Parameters<T>, ConstructorParameters<T>, ReturnType<T> and InstanceType<T> from

T extends (...args: any[]) => any

to the less restrictive

T extends (...args: any) => any

With this change, the types can be applied to functions that themselves have generic rest parameters. For example:

type Foo<T extends any[]> = ReturnType<(...args: T) => string>;  // string

Previously, this was an error.

Fixes #26856.