visgraph: init window.eventHub as external emitter called in Vue. This implementation works with vue2, but is deprecated in vue3 !!

see https://vue3-fr.netlify.app/guide/migration/events-api.html#_2-x-syntax

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/index.js

@@ -3,6 +3,7 @@ import { store } from "./store.js"
 import { _createI18n } from 'ChillMainAssets/vuejs/_js/i18n'
 import { visMessages } from './i18n'
 import App from './App.vue'
+
 import './vis-network'
 
 const i18n = _createI18n(visMessages)