Support required at higher level for allOf and oneOf

[abonifacio]

Why

Given the following spec

components:
  schemas:
    User:
      type: object
      properties:
        name:
          type: string
        email:
          type: string
    RegisteredUser:
      type: object
      allOf:
        - $ref: "#/components/schemas/User"
      required:
        - name
        - email

Resulting types are

interface User {
  name?: string;
  email?: string;
}
type RegisteredUser = User;

With this change, resulting types are

type Require<T,R extends keyof T> = T & Required<Pick<T, R>>;
interface User {
  name?: string;
  email?: string;
}
type RegisteredUser = Require<User, "name" | "email">;

This adds a helper type (Require<T,R extends keyof T>) to make it more readable, otherwise the output would be

type RegisteredUser = User & Required<Pick<User,  "name" | "email">>;

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