能否支持下h2:grpc协议的流量回放功能？

**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**

**Describe the solution you'd like (描述你期望的解决方法)**
通过现有的流量采样工具记录请求，通过rpc_replay来回放请求

**Describe alternatives you've considered (描述你想到的折衷方案)**

**Additional context/screenshots (更多上下文/截图)**

Start by reviewing the existing traffic sampling tool and the rpc_replay entry point to understand how requests are recorded and replayed. Determine the requirements for h2:grpc traffic, including what must be captured and reproduced. Done means sampled h2:grpc requests can be replayed through rpc_replay.

Written by the indexing model from the issue text.