fix: connections overflow when command processing takes too long and clients close connection

[wangshao1]

pika服务端在收到一个完整的redis请求之后会关闭可读事件的唤醒。
特殊情况下，比如存量数据很多，用户使用了scan接口导致请求在服务端处理耗时达到了几十秒，此时如果用户代码中设置了超时，那么连接会被客户端关闭，但服务端直到命令处理完才会再次注册connfd相关事件，所以导致服务端积累了大量的close_wait连接，最终可能会达到pika设定的连接数上线从而停止接收新的建连请求。

[coderabbitai]

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