[I] serve 端通过channel 访问其他服务，内存持续缓慢上涨，疑似内存泄漏 (brpc)

[via GitHub]

qhren opened a new issue, #2633:
URL: https://github.com/apache/brpc/issues/2633

   **Describe the bug (描述bug)**
   服务运行一段时间后，内存持续上涨
   
   **To Reproduce (复现方法)**
   链接tcmalloc，打开fno-omit-frame-pointer 编译选项 和 heap 
profiler，对比前后的内存占用diff，发现内存消耗在channel init和channel call调用。
   下图中的sumit_post_request的基本结构如下：
    ``` 
       baidu::rpc::Channel channel;
       baidu::rpc::ChannelOptions options;
       baidu::rpc::Controller cntl;
       options.protocol = baidu::rpc::PROTOCOL_HTTP;
       options.timeout_ms = 60000;
       options.max_retry = 3;
   
       if (channel.Init(uri.c_str(), "", &options) != 0) {
           CFATAL_LOG("init channel failed url = %s ", base_url.c_str());
           return ErrorCode::ERROR;
       }
   
       cntl.http_request().set_method(baidu::rpc::HTTP_METHOD_POST);
       cntl.http_request().uri() = base_url;
       cntl.http_request().set_content_type("application/json");  // set 
content type
       cntl.request_attachment().append(data_json_str);
   
       channel.CallMethod(NULL, &cntl, NULL, NULL, NULL);
       if (cntl.Failed()) {
           CFATAL_LOG("rpc failed error text = %s", cntl.ErrorText().c_str());
           ret_code = -1;
           return ErrorCode::ERROR;
       }
   
       o_res_json_str = cntl.response_attachment().to_string();
       ret_code = 200;
       return ErrorCode::SUCCESS;
   ```
   **Expected behavior (期望行为)**
   内存在服务压力变化不大的情况下基本维持稳定
   
   **Versions (各种版本)**
   OS:centos 6.3
   Compiler: gcc12
   brpc: stable 版本
   protobuf: protobuf 2.4
   
   **Additional context/screenshots (更多上下文/截图)**
   heap profiler 时间：
   
![image](https://github.com/apache/brpc/assets/40328739/e9fcdeca-207e-420b-b0be-a821650243a6)
   内存占用对比差异：
   
![image](https://github.com/apache/brpc/assets/40328739/0c68a846-20a4-4a02-a569-b91c6da98f01)
   


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