feat: Add CSAT response APIs (#2503)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

config/routes.rb

@@ -87,6 +87,7 @@ Rails.application.routes.draw do
               resources :labels, only: [:create, :index]
             end
           end
+          resources :csat_survey_responses, only: [:index]
           resources :custom_filters, only: [:index, :show, :create, :update, :destroy]
           resources :inboxes, only: [:index, :create, :update, :destroy] do
             get :assignable_agents, on: :member