feat: Adds sound alert notification for new messages on the widget (#3181)

* feat: Adds sound alert notification for new messages on the widget

* Review fixes

* uses absolute path

* Minor fixes

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/packs/widget.js

@@ -4,6 +4,7 @@ import VueI18n from 'vue-i18n';
 import store from '../widget/store';
 import App from '../widget/App.vue';
 import ActionCableConnector from '../widget/helpers/actionCable';
+import { getAlertAudio } from 'shared/helpers/AudioNotificationHelper';
 import i18n from '../widget/i18n';
 
 Vue.use(VueI18n);
@@ -30,4 +31,5 @@ window.onload = () => {
     window.WOOT_WIDGET,
     window.chatwootPubsubToken
   );
+  getAlertAudio();
 };