feat(router): add a provider making angular1/angular2 integration easier

[vsavkin]

Closes #12690

[vikerman]

@vsavkin - e2e test failures

[poke]

With this change, the router now requires @angular/upgrade as a peer dependency, even if Angular 1 integration is not required by the project. Was this an intentional choice? Isn’t this conflicting with the modular idea that you only need to import those modules you actually need for your project?

[poke]

Okay, this was also reported as #12895 and fixed with #12896.

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