feat: Add backend changes for whatsapp csat template (#12984)

This PR add the backend changes for the feature [sending CSAT surveys
via WhatsApp message templates
](https://github.com/chatwoot/chatwoot/pull/12787)

---------

Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>

config/routes.rb

@@ -203,6 +203,8 @@ Rails.application.routes.draw do
             delete :avatar, on: :member
             post :sync_templates, on: :member
             get :health, on: :member
+
+            resource :csat_template, only: [:show, :create], controller: 'inbox_csat_templates'
           end
           resources :inbox_members, only: [:create, :show], param: :inbox_id do
             collection do