feat(wonderpush): new Delegate methods + Add initialize() and isInitialized() methods (#4942)

* feat(wonderpush): new Delegate methods

* feat(wonderpush): Add initialize() and isInitialized() methods

---------

Co-authored-by: Stéphane JAIS <stephane@wonderpush.com>

src/@awesome-cordova-plugins/plugins/wonderpush/index.ts

@@ -2,7 +2,9 @@ import { Injectable } from '@angular/core';
 import { Plugin, Cordova, AwesomeCordovaNativePlugin, getPromise } from '@awesome-cordova-plugins/core';
 
 export interface WonderPushDelegate {
-  urlForDeepLink(url: string, callback: (url?: string) => void): void;
+  urlForDeepLink?: (url: string, callback: (url?: string) => void) => void;
+  onNotificationOpened?: (notification: object, buttonIndex: number) => void;
+  onNotificationReceived?: (notification: object) => void;
 }
 
 export interface WonderPushChannel {
@@ -226,6 +228,31 @@ export class UserPreferencesMethods extends NestedObject {
 })
 @Injectable()
 export class WonderPush extends AwesomeCordovaNativePlugin {
+
+  /**
+   * Initializes the WonderPush SDK
+   * @param clientId
+   * @param clientSecret
+   * @param onSuccess
+   * @param onFailure
+   * @returns {Promise<any>}
+   */
+  @Cordova()
+  initialize(clientId: string, clientSecret: string): Promise<any> {
+    return;
+  }
+
+  /**
+   * Whether the SDK has been initialized.
+   *
+   * The SDK is ready when it is initialized with its Client ID and Client Secret.
+   * @returns {Promise<boolean>}
+   */
+  @Cordova()
+  isInitialized(): Promise<boolean> {
+    return;
+  }
+
   /**
    * Sets the user id, used to identify a single identity across multiple devices,
    * and to correctly identify multiple users on a single device.