add ability to use timestamp server

lib/accounts.rb

@@ -71,6 +71,14 @@ module Accounts
     end
   end
 
+  def load_timeserver_url(account)
+    if Docuseal.multitenant?
+      Docuseal::TIMESERVER_URL
+    else
+      EncryptedConfig.find_by(account:, key: EncryptedConfig::TIMESTAMP_SERVER_URL_KEY)&.value
+    end.presence
+  end
+
   def can_send_emails?(_account)
     return true if Docuseal.multitenant?
     return true if ENV['SMTP_ADDRESS'].present?