rpcinfo.GetRPCInfo获取的rpc_info非线程安全

**Describe the bug**

代码底层使用了pool ，但是rpcinfo.GetRpcInfo()拿到了引用，如果在A方法异步去做。可能会被recycle拿到了空的属性，或者拿到B方法的属性(可能被此时的B方法从pool里取出并赋值)
这个feature有点坑啊。。。 如果非线程安全，那不要暴露出来。。或者COW

**To Reproduce**

Minimal code or configuration to reproduce the issue:

```go
// paste your code here
```

Steps:
1. ...
2. ...

**Expected behavior**

A clear and concise description of what you expected to happen.

**Actual behavior**

What actually happened. Include error messages, logs, or panic stack traces if available.

```
// paste error output or logs here
```

**Environment:**

- Kitex version: (e.g. v0.12.1)
- Protocol: (Thrift / Protobuf / gRPC)
- Transport: (TTHeader / HTTP2 / Framed / ...)

output of go env

```
// paste the output of `go env` here
```

**Additional context**

Any other context such as IDL definitions, network topology, proxy/mesh setup, or service governance configuration (retry, circuit breaker, load balancer, etc.).