feat(Router): Expose DI modules for Angular Router in top-level lib   - Follows from cl/231722909
feat(Router): Expose DI modules for Angular Router in top-level lib
  - Follows from cl/231722909

PiperOrigin-RevId: 232021903

angulardart/angular,matanlurey/angular,matanlurey/angular,angulardart/angular,angulardart/angular,matanlurey/angular