Group property doesn't include in stack navigator

The `Group` property doesn't include in the `RootStack` created by `createSharedElementStackNavigator`. In react-navigation 6 I have to use `RootStack.Group` tag to use a modal. When I check the types and it's only include `Navigator` and `Screen` property, not `Group` property.

``` js

const RootStack = createSharedElementStackNavigator();
.
.
.
return (

/**
Group property doesn't exist and shows "Couldn't find any screens for the navigator.
Have you defined any screens as it's children?" error message
*/


```

Start at createSharedElementStackNavigator and inspect the returned navigator types and its React Navigation 6 compatibility. Compare the exposed Navigator and Screen properties with the required Group usage; done means RootStack.Group is available and the reported navigator error no longer occurs.

Written by the indexing model from the issue text.