[go_router] Move from ShellRoute to StateFulShellRoute in order to prevent the page from losing their state when switching tabs.

[neganngdev]

[go_router] Move from ShellRoute to StateFulShellRoute in order to prevent the page from losing their state when switching tabs.

reference:
https://gist.github.com/tolo/b26bd0ccb89a5fa2e57ec715f8963f2a#file-cupertino_stateful_nested_navigation-dart-L4