feat: Add CSAT response APIs (#2503)

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

spec/factories/csat_survey_responses.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :csat_survey_response do
+    rating { 1 }
+    feedback_message { Faker::Movie.quote }
+    account
+    conversation
+    message
+    contact
+  end
+end