Allow exporting types as types instead of interfaces

[stavros-k]

As Interface

interface User {
    name: string;
}

As Type

type User = {
  name: string
}

[Emyrk]

@stavros-k would you want every typescript interface to be converted to a type? Or just some select ones?

If it is all of the generated interfaces, I think I can accomplish it with a mutation

[stavros-k]

Personally I want all of them!