[Proposal] tri support protostuff for dynamic proto object

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

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Behavior

### Actual Behavior

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

The issue title proposes protostuff support for dynamic proto objects, but provides no implementation files, tests, reproduction steps, expected behavior, or actual behavior. Begin by clarifying the intended protocol and scope before locating the relevant Dubbo entry points and defining acceptance tests.

Written by the indexing model from the issue text.