feat: Ability to delete a contact (#2984)

This change allows the administrator user to delete a contact and its related data like conversations, contact inboxes, and reports.

Fixes #1929

app/javascript/dashboard/store/modules/conversations/index.js

@@ -177,6 +177,13 @@ export const mutations = {
       Vue.set(chat, 'can_reply', canReply);
     }
   },
+
+  [types.default.CLEAR_CONTACT_CONVERSATIONS](_state, contactId) {
+    const chats = _state.allConversations.filter(
+      c => c.meta.sender.id !== contactId
+    );
+    Vue.set(_state, 'allConversations', chats);
+  },
 };
 
 export default {