feat(onesignal): add missing functions

closes: #2504

src/@ionic-native/plugins/onesignal/index.ts

@@ -706,9 +706,66 @@ export class OneSignal extends IonicNativePlugin {
     return;
   }
 
+  /**
+   * Allows you to set the user's email address with the OneSignal SDK.
+   * @param {string} email Email address
+   * @param {string} [emailAuthToken] Email auth token
+   */
+  @Cordova()
+  setEmail(email: string, emailAuthToken?: string): Promise<any> {
+    return;
+  }
+
+  /**
+   * If your app implements logout functionality, you can call logoutEmail to dissociate the email from the device
+   */
+  @Cordova()
+  logoutEmail(): Promise<any> {
+    return;
+  }
+
+  /**
+   * The passed in function will be fired when a notification subscription property changes.
+   * This includes the following events:
+   * - Getting a push token from Apple / Google.
+   * - Getting a player / user id from OneSignal
+   * - OneSignal.setSubscription is called
+   * - User disables or enables notifications
+   * @return {Observable<any>}
+   */
+  @Cordova({
+    observable: true
+  })
+  addEmailSubscriptionObserver(): Observable<any> {
+    return;
+  }
+
   /**
    * Clears all OneSignal notifications
    */
   @Cordova({ sync: true })
   clearOneSignalNotifications(): void {}
+
+  /**
+   * Allows you to delay the initialization of the SDK until the user provides privacy consent.
+   * The SDK will not be fully initialized until the provideUserConsent(true) method is called.
+   * @param {boolean} required
+   */
+  @Cordova()
+  setRequiresUserPrivacyConsent(required: boolean): void {}
+
+  /**
+   * If your application is set to require the user's privacy consent, you can provide this consent using this method.
+   * Until you call provideUserConsent(true), the SDK will not fully initialize and will not send any data to OneSignal.
+   * @param {boolean} granted
+   */
+  @Cordova()
+  provideUserConsent(granted: boolean): void {}
+
+  /**
+   * Accepts a callback, which returns a boolean variable indicating if the user has given privacy consent yet.
+   * @param {Function} callback
+   */
+  @Cordova()
+  userProvidedPrivacyConsent(callback: Function): void {}
 }