@xstate/store: Support defining events inline with createStoreWithProducer

[yergom]

In version 2.6.0 the API was modified to use the the configuration API, and it's now possible to emit values. However, it's not possible to define the event types inline. It should be possible to define it like this:

const store = createStoreWithProducer(
  // Producer
  produce,
  {
    //types is missing!
    types: {
      emitted: {} as { type: 'incremented'; by: number },
    },
    context: { count: 0, todos: [] },
    on: {
      inc: (context, event: { by: number }) => {
        // No return; handled by Immer
        context.count += event.by;
      },
      addTodo: (context, event: { todo: string }) => {
        // No return; handled by Immer
        context.todos.push(event.todo);
      },
    },
  },
);