[GSoC 2025] Service Discovery

### Pre-check

- [x] I am sure that all the content I provide is in English.

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/dubbo/issues?q=is%3Aissue) and found no similar feature requirement.

### Apache Dubbo Component

Java SDK (apache/dubbo)

### Descriptions

https://cwiki.apache.org/confluence/display/COMDEV/GSoC+2025+Ideas+list#GSoC2025Ideaslist-GSoC2025-ServiceDiscovery

### Related issues

_No response_

### Are you willing to submit a pull request to fix on your own?

- [x] Yes I am willing to submit a pull request on my own!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start with the linked GSoC 2025 Service Discovery proposal and the Java SDK in apache/dubbo. The issue provides no files, tests, entry points, or completion criteria, so the scope and definition of done must be established before implementation.

Written by the indexing model from the issue text.