[Feature Request] Support PutUserProperty

In java we can use `message. putUserProperty` to append some metadata into message, this is sometimes very useful, but in nodejs client we have not found how we can do this. Could you support this please?

首先定位 Node.js 客户端的 message API，并将其可用的元数据方法与 Java 的 message.putUserProperty 行为进行比较。在客户端中实现等效的用户属性功能，并验证调用方可以向消息追加元数据。

由索引模型根据 Issue 内容生成。