Contribute label routing

[steverao]

Background

Recently, we have developed the label routing function related to microservice governance. The current state is basically completed. There are many areas that need to be optimized and improved. We welcome everyone to contribute, improve the documentation, and optimize the code.

Reference

• code branch: https://github.com/alibaba/spring-cloud-alibaba/tree/2.2.x-governance/spring-cloud-alibaba-examples/governance-example/label-routing-example
• We are also working on the istio control plane, more specific you can refer to Spring Cloud Alibaba Traffic Governance Scheme Design | Spring Cloud Alibaba流量治理方案设计 #2700