feat(effects): add EffectsRunner to public API (#2427)

Author: kylecannon

modules/effects/src/index.ts

@@ -11,6 +11,7 @@ export { EffectsMetadata, CreateEffectMetadata } from './models';
 export { Actions, ofType } from './actions';
 export { EffectsModule } from './effects_module';
 export { EffectSources } from './effect_sources';
+export { EffectsRunner } from './effects_runner';
 export { EffectNotification } from './effect_notification';
 export { EffectsFeatureModule } from './effects_feature_module';
 export {