Add complete basic routes handling as Flutter Navigator

[nicolasvac]

GoRouter as of now is lacking behind the current methods available by the flutter navigator.

Currently missing to get at least the basics completely working:

• [ ] Navigator.removeRoute https://api.flutter.dev/flutter/widgets/Navigator/removeRoute.html
• [ ] Navigator.popUntil https://api.flutter.dev/flutter/widgets/Navigator/popUntil.html
• [ ] Navigator.pushAndRemoveUntil https://api.flutter.dev/flutter/widgets/Navigator/pushAndRemoveUntil.html
• [ ] Navigator.replace https://api.flutter.dev/flutter/widgets/Navigator/replace.html

[csells]

That's a good feature request

[jamolina2021]

These features are essential. :)

[csells]

PRs graciously accepted. : )