[Feature] Email collect message hooks (#331)

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

app/javascript/widget/store/index.js

@@ -1,13 +1,15 @@
 import Vue from 'vue';
 import Vuex from 'vuex';
-import conversation from 'widget/store/modules/conversation';
 import appConfig from 'widget/store/modules/appConfig';
+import contact from 'widget/store/modules/contact';
+import conversation from 'widget/store/modules/conversation';
 
 Vue.use(Vuex);
 
 export default new Vuex.Store({
   modules: {
     appConfig,
+    contact,
     conversation,
   },
 });