We would like to integrate state restoration to web application.

This includes:

1. Web engine listens to restorable state reported from the framework and save the restorable state into the browser history entry. (blocked on [web] implement PluginUtilities for flutter web #33615)
2. Web engine starts sending the restorable state to the framework as part of onPopstate event(when user click forward or backward buttons)
3. Provides an opinionated route information parser and router delegate that will restore the app automatically when it receives the restorable state