feat: handle picture change events

src/Types/Contact.ts

@@ -7,6 +7,13 @@ export interface Contact {
     /** I have no idea */
     verifiedName?: string
     // Baileys Added
-    imgUrl?: string
+    /**
+     * Url of the profile picture of the contact
+     *
+     * 'changed' => if the profile picture has changed
+     * null => if the profile picture has not been set (default profile picture)
+     * any other string => url of the profile picture
+     */
+    imgUrl?: string | null | 'changed'
     status?: string
 }