Changes to Get Developer Settings

added the optional property call_started_developer_alert_caller_numbers to the response with the 200 status

removed the required property call_started_developer_alert_enabled from the response with the 200 status

added the required property call_started_developer_alert_inbound_enabled to the response with the 200 status

added the required property call_started_developer_alert_outbound_enabled to the response with the 200 status