[WIP] Fix potential crash when multiple TcpClient/UdpClient share an EventLoop

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

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<issue_title>多个TcpClient/UdpClient共用一个EventLoop，析构时有概率崩溃</issue_title>
<issue_description>
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Comments on the Issue (you are @copilot in this section)

@ithewei 退出线程时应该等待IO线程结束，return 0前，加 ``` loopThread.stop(); loopThread.join(); ``` 试试 @ithewei 最新master分支上有个修复，看看带上没https://github.com/ithewei/libhv/commit/41c63bfbf0e4817711febfbe695609d524d4af85 @ithewei 是的，这种方式必须十分小心TcpClient/UdpClient的生命周期，最好的实践是使用堆对象，然后调用loop->runInLoop{delete cli;}在事件循环所在线程里删除对象，参考这个示例程序 https://github.com/ithewei/libhv/blob/master/evpp/TcpClientEventLoop_test.cpp @ithewei > 是的，这种方式必须十分小心TcpClient/UdpClient的生命周期，最好的实践是使用堆对象，然后调用loop->runInLoop{delete cli;}在事件循环所在线程里删除对象，参考这个示例程序 https://github.com/ithewei/libhv/blob/master/evpp/TcpClientEventLoop_test.cpp

参考这个结论，最佳实践是在loop所在线程去析构TcpClient/UdpClient对象</comment_new>

• Fixes 多个TcpClient/UdpClient共用一个EventLoop，析构时有概率崩溃 #704

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[ithewei]

@copilot try again