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/contactConversations.js

@@ -82,6 +82,9 @@ export const mutations = {
     const conversations = $state.records[id] || [];
     Vue.set($state.records, id, [...conversations, data]);
   },
+  [types.default.DELETE_CONTACT_CONVERSATION]: ($state, id) => {
+    Vue.delete($state.records, id);
+  },
 };
 
 export default {