[go_router] Support return data from a screen with pop() #99663
Description
Use case
With Navigator, we can push to new screen and await result.
final result = await Navigator.push(
context,
// Create the SelectionScreen in the next step.
MaterialPageRoute(builder: (context) => const SelectionScreen()),
);
Currently go_router is support push, go but it return void.
/// Navigate to a URI location w/ optional query parameters, e.g.
/// `/family/f2/person/p1?color=blue`
void go(String location, {Object? extra}) =>
routerDelegate.go(location, extra: extra);
/// Push a URI location onto the page stack w/ optional query parameters, e.g.
/// `/family/f2/person/p1?color=blue`
void push(String location, {Object? extra}) =>
routerDelegate.push(location, extra: extra);
Expected Behaviour: push, go support return a Future and user can call pop with a result.
This is sample for this feature: