Observability Task:Tracking the Facade Framework Research（可观测性任务链路追踪门面框架调研）

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Describe the proposal

English: As a low-level framework middleware, Dubbo needs to reduce the coupling with the third-party link tracking system as much as possible, so a solution is needed to realize it. Currently, the more popular link tracking facades that can be referred to are: opentracing and micrometer tracing. Of course, there are other better options that you can also try.

中文：Dubbo作为一个底层的框架中间件，需要尽可能的降低与第三方链路追踪系统的耦合，所以需要一个解决方案来实现，目前可以参考的比较流行的链路追踪门面为：opentracing与micrometer tracing。当然还有其他更好的也可以尝试选择。