Feature: Contact Panel with conversation details (#397)

* Add Contact panel changes

* Fix parent iframe blocked

* Add Conversation Panel, Contact messages

* Update contact panel with conversation details

* Update designs in sidebar

* Fix specs

* Specs: Add specs for conversationMetadata and contact modules

* Fix currentUrl issues

* Fix spelling

* Set default to empty string

app/javascript/dashboard/store/modules/conversationMetadata.js

@@ -0,0 +1,28 @@
+import Vue from 'vue';
+import * as types from '../mutation-types';
+
+const state = {
+  records: {},
+};
+
+export const getters = {
+  getConversationMetadata: $state => id => {
+    return $state.records[Number(id)] || {};
+  },
+};
+
+export const actions = {};
+
+export const mutations = {
+  [types.default.SET_CONVERSATION_METADATA]: ($state, { id, data }) => {
+    Vue.set($state.records, id, data);
+  },
+};
+
+export default {
+  namespaced: true,
+  state,
+  getters,
+  actions,
+  mutations,
+};