Proposal: Hook to override default stub creation

[freakzlike]

As mentioned in #1174 (comment). I want to be able to customize the default creation of a stubbed component, when using shallowMount or stubs: { ChildComponent: true }.

This could look something like:

const wrapper = shallowMount(MyComponent, {
  global: {
    createStubs: ({ name, component }) => {
      // Implement own logic to create a stub
      return defineComponent({
        name,
        render: () => // Custom render logic
      })
    }
  }
})

If set the hook would be called once for every component instead of createStub.
https://github.com/vuejs/vue-test-utils-next/blob/5bfe95cc71f6d07aff576a66bf450e6f23a26a36/src/stubs.ts#L282-L288

Unfortunately I was not able to find another way, without manually create a stub for every component. I tried to use transformVNodeArgs by myself but it will be replaced when I do mount.