feat(core): Adds DI support for providedIn: 'platform'|'any' (#32154)

Extend the vocabulary of the `providedIn` to also include  `'platform'` and `'any'`` scope.
```
@Injectable({
  providedId: 'platform', // tree shakable injector for platform injector
})
class MyService {...}
```

PR Close #32154

packages/core/src/di/scope.ts

@@ -14,5 +14,4 @@ import {InjectionToken} from './injection_token';
  * as a root scoped injector when processing requests for unknown tokens which may indicate
  * they are provided in the root scope.
  */
-export const APP_ROOT = new InjectionToken<boolean>(
-    'The presence of this token marks an injector as being the root injector.');
+export const INJECTOR_SCOPE = new InjectionToken<'root'|'platform'|null>('Set Injector scope.');