使用 protobuf 和 triple 协议的接口如何泛化调用？

背景: 现在有个 dubbo-proxy 服务，通过 Netty + 泛化调用供接口测试，性能压测等。

但是到 PB + Tri 组合之后，泛化调用不生效了，根据 sample 里的示例得将 dubbo-complier 生成的文件引入后，才能用泛化调用。那就太不泛化了。

有没有什么办法像之前那样泛化调用呢，或者有没有其他工具像调用 HTTP 接口一样，动态地调用 Triple 协议呢？

Start with the dubbo-proxy service and its Netty-based generic invocation path, then compare it with the sample that imports files generated by dubbo-complier. Investigate how PB + Tri requests are described and whether dynamic Triple invocation can work without generated files. Done means documenting or implementing a viable generic approach, or identifying a supported alternative tool and its limitations.

Written by the indexing model from the issue text.