feat(scheduledevents): Event cover images for v13 (#7613)

Co-authored-by: Suneet Tipirneni <77477100+suneettipirneni@users.noreply.github.com>

src/structures/GuildScheduledEvent.js

@@ -156,6 +156,21 @@ class GuildScheduledEvent extends Base {
     } else {
       this.entityMetadata ??= null;
     }
+
+    /**
+     * The cover image hash for this scheduled event
+     * @type {?string}
+     */
+    this.image = data.image ?? null;
+  }
+
+  /**
+   * The URL of this scheduled event's cover image
+   * @param {StaticImageURLOptions} [options={}] Options for image URL
+   * @returns {?string}
+   */
+  coverImageURL({ format, size } = {}) {
+    return this.image && this.client.rest.cdn.guildScheduledEventCover(this.id, this.image, format, size);
   }
 
   /**