feat: Add CSAT response APIs (#2503)

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

app/models/account.rb

@@ -34,6 +34,7 @@ class Account < ApplicationRecord
   has_many :account_users, dependent: :destroy
   has_many :agent_bot_inboxes, dependent: :destroy
   has_many :agent_bots, dependent: :destroy
+  has_many :csat_survey_responses, dependent: :destroy
   has_many :data_imports, dependent: :destroy
   has_many :users, through: :account_users
   has_many :inboxes, dependent: :destroy