[Bug] Keep-alive timeout when send/receive large message

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar-client-cpp/issues) and found nothing similar.

### Version

client 3.2
server 3.2.2

### Minimal reproduce step

Use a producer to send one 300M message to the broker using synchronous mode with 5M bandwidth, just make sure the message to be sent in almost one minute.
BTW, it works fine for small message, for example, messages less than 100M can be successfully sent or consumed within 5M bandwidth

### What did you expect to see?

Send successfully

### What did you see instead?

2024-04-28 16:58:11.157 WARN [40520] D:\a\pulsar-client-cpp\pulsar-client-cpp\lib\ClientConnection:1158 | [10.214.4.3:49457 -> 8.218.192.194:6650] Forcing connection to close after keep-alive timeout
2024-04-28 16:58:11.157 ERROR [40520] D:\a\pulsar-client-cpp\pulsar-client-cpp\lib\ClientConnection:1234 | [10.214.4.3:49457 -> 8.218.192.194:6650] Connection closed with ConnectError

### Anything else?

When I use asynchronous mode in the producer side, this issue is mitigated, while the consumer stuck into it. I find the keepalive interval is hardcoded in ClientConnection.cc and the value is 30 seconds, and I also find it executed by a deadline timer which run in a separated thread, thus I am not sure if this has something to do with the large message sending or receiving

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

从 ClientConnection.cc 开始，重点检查硬编码的 30 秒 keep-alive 间隔及其 deadline timer。使用 client 3.2 和 server 3.2.2，在 5M 带宽下发送同步 300M 消息进行复现，然后比较同步和异步 producer 的行为以及 consumer 的行为。当大数据发送或接收能够完成，且 keep-alive timeout 不会关闭连接时，即视为完成。

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