[Feature] Email collect message hooks (#331)

- Add email collect hook on creating conversation
- Merge contact if it already exist

app/javascript/packs/widget.js

@@ -1,9 +1,12 @@
 import Vue from 'vue';
+import Vuelidate from 'vuelidate';
 import store from '../widget/store';
 import App from '../widget/App.vue';
 import router from '../widget/router';
 import ActionCableConnector from '../widget/helpers/actionCable';
 
+Vue.use(Vuelidate);
+
 Vue.config.productionTip = false;
 window.onload = () => {
   window.WOOT_WIDGET = new Vue({