1 方法调用流程
1.1 notify.notifier.Notifier.sample
notify.notifier.Notifier._notify ->
notify.messaging.MessagingV2Driver.notify ->
transport.NotificationTransport._send_notification ->
_drivers.impl_rabbitmq.RabbitDriver.send_notification ->
_drivers.amqpdriver.AMQPDriverBase.send_notification ->
_drivers.amqpdriver.AMQPDriverBase._send
2 其他
2.1 notify.notifier.Notifier
该类初始化时接收目标队列参数，如果提供目标队列参数，则消息发到目标队列，否则默认发到notifications队列，默认值从配置项读取
