fix(effects): add EffectsRootModule and EffectsFeatureModule to public API (#2273)

Fixes Ivy support in Bazel: angular/angular#33373

Author: brandonroberts

modules/effects/src/index.ts

@@ -8,7 +8,12 @@ export { Actions, ofType } from './actions';
 export { EffectsModule } from './effects_module';
 export { EffectSources } from './effect_sources';
 export { EffectNotification } from './effect_notification';
-export { ROOT_EFFECTS_INIT, rootEffectsInit } from './effects_root_module';
+export { EffectsFeatureModule } from './effects_feature_module';
+export {
+  ROOT_EFFECTS_INIT,
+  rootEffectsInit,
+  EffectsRootModule,
+} from './effects_root_module';
 export { act } from './act';
 export {
   OnIdentifyEffects,