[go_router] Add parentNavigatorKey to ShellRoute #111678
Description
Right now, ShellRoute does not support parentNavigatorKey. The behavior would be the same as GoRoute. For example, in this configuration, navigating to /a/b/c would place a new page on top of the root ShellRoute's page for routes b and c:
ShellRoute(
routes: [
GoRoute(
path: '/a',
routes: [
ShellRoute(
parentNavigatorKey: root
routes: [
GoRoute(
path: 'b'
routes: [
GoRoute(
path: 'c',
),
],
),
],
),
],
),
],
)