feat(effects): export EffectConfig and add docs

Author: ijz953

modules/effects/src/index.ts

@@ -1,4 +1,5 @@
 export { createEffect } from './effect_creator';
+export { EffectConfig } from './models';
 export { Effect } from './effect_decorator';
 export { getEffectsMetadata } from './effects_metadata';
 export { mergeEffects } from './effects_resolver';

modules/effects/src/models.ts

@@ -1,5 +1,15 @@
+/**
+ * Configures an effect creator.  See `createEffect`.
+ */
 export interface EffectConfig {
+  /**
+   * Determines if the action emitted by the effect is dispatched to the store.
+   * If false, effect does not need to return type `Observable<Action>`.
+   */
   dispatch?: boolean;
+  /**
+   * Determines if the effect will be resubscribed if an error occurs in the main actions stream.
+   */
   resubscribeOnError?: boolean;
 }