types: making defineComponent return a valid Component type fix #993

[pikax]

Fixes #993

const Comp = defineComponent({
  setup() {
    return {};
  }
});

export const someComponents: Component[] = [Comp]; //error

[pikax]

I dont know if is possible do this without casting

[yyx990803]

This should make PublicAPIComponent unnecessary, right?

[pikax]

Not necessarily, because ClassComponent is not part of Component, only h needs special typing to provide props validations, PublicAPIComponent can't be used in h because is quite generic and everything would fall under that overload.

That said, for the exposed APIs I think is much better using PublicAPIComponent, probably renaming it to Component and rename Component to InternalAPIComponent(or better name) would make more sense to the user.