[feat][cpp-client] PIP-145: Notifications for faster topic discovery - already implemented in Java client but not yet in C++?

Hi,
Any idea if this already implemented feature from JAVA client is implemented in C++ client also?
https://github.com/apache/pulsar/issues/14505
https://github.com/apache/pulsar/pull/16062/files

I tried to look in source code. I only see Commands.cc updated with WatchTopic* commands but nothing else.

If this is already implemented, appreciate sharing any sample code to use this feature

首先检查 Commands.cc 和 WatchTopic* 命令，然后将 C++ 客户端与 issue 14505 和 pull request 16062 中引用的 Java 实现进行比较。完成的标准是确认通知是否可用；如果可用，则记录示例用法；否则明确界定缺失的 C++ 实现范围。

由索引模型根据 Issue 内容生成。