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

config/routes.rb

@@ -76,7 +76,7 @@ Rails.application.routes.draw do
             end
           end
 
-          resources :contacts, only: [:index, :show, :update, :create] do
+          resources :contacts, only: [:index, :show, :update, :create, :destroy] do
             collection do
               get :active
               get :search