dubbo3未来是否支持其他更友好的IDL方式呢

目前提供的photobuf在定义服务的时候只能有一个入参和返参对象，导致之前使用dubbo定义的java接口并不能直接通过photobuf发布给其他语言进行使用，那些多参数的老接口如果其他语言想用的话 java端必须按照从新定义内部实现规则，对老代码迁移不太友好，可以参考zeroc ice的slicestub的IDL方式

The issue proposes a friendlier IDL than the current protobuf approach, referencing ZeroC Ice Slice, so multilingual clients can use legacy Java interfaces with multiple parameters. Start by reviewing Dubbo’s current protobuf service-definition limitations and comparing the Slice IDL model. Done would require an agreed design and implementation plan, but the issue names no files or tests.

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