[REQ] [angular-typescript] Support lazy loaded module

Is your feature request related to a problem? Please describe.

I'd like to use the generated services in a lazy loaded module in angular. So all related code should not be part of the initial bundle.

Describe the solution you'd like

Either this should be possible by default (preferred) or possible to enable via a configuration option.

Describe alternatives you've considered

Importing the GeneratedModule.forRoot(..) in a lazy loaded module currently won't respect the provided Configuration.

Additional context

Probably the services should be provided in the generated module - e.g.:

@Injectable({
  providedIn: MyApiModule,
})
export class MyApiStubService {
}

see https://angular.io/guide/providers#providedin-and-ngmodules

Start with the angular-typescript generator's generated module and the GeneratedModule.forRoot(..) entry point described in the issue. Investigate how services and Configuration are registered for lazy-loaded modules; done means generated code can be loaded lazily without entering the initial bundle and Configuration is respected.