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/contacts/index.js

@@ -13,6 +13,7 @@ const state = {
     isFetchingItem: false,
     isFetchingInboxes: false,
     isUpdating: false,
+    isDeleting: false,
   },
   sortOrder: [],
 };