Release v2.0.0

⭐ Feature

• Support xDS protocol to communicate with the Control Plane of Service Mesh. Issue #1515
  (1)Implements communication based on the xDS protocol and Istio data plane.
  (2)Implements the service discovery capability in the K8S scenario based on the CDS and EDS protocols.
  (3)In the Kubernetes scenario, the Sermant framework implements the service discovery capability based on the CDS and EDS protocols and provides an interface for the Sermant plugin to obtain service instances.
• Support configuration management on the sermant-backend. Issue #1528
  (1)Support configuration management on the sermant-backend page.
  (2)Support Zookeeper, Nacos, and Kie configuration centers.

📈 Improvements

• Refactor all packages to io.sermant to keep a consistent directory structure. Issue #1505
• Reconstruct the dynamic configuration service and provide services for the sermant-backend through a unified interface. Issue #1523
• Reduce startup time of sermant-agent. Issue #1541
• Support user-defined parameters on the attach command. Issue #1552
• Support English version for sermant-backend. Issue #1553
• Support the Redis cluster on the sermant-backend. Issue #1555

🐞 Fixes

• Fix the issue that the unit test of the springboot-registry plugin fails to be executed. Issue #1501
• Fix the issue that the plugin configuration fails to be dynamically loaded for the second time. Issue #1520
• Fix the issue that the ConfigSubscriber mode not support Map. Issue #1536
• Fix Open-Source Software Vulnerabilities. Issue #1558

📔 Documentation

• Translate code comments and documents into English. Issue #1466
• Add Licenses for project dependencies. Issue #1499