这是网络系统使用的网络客户端类，其中包含用于连接到网络服务器的 NetworkConnection。
NetworkClient 处理连接状态、消息处理程序和连接配置。一个进程中可以同时有多个 NetworkClient 实例，但只有一个实例连接到使用衍生对象的游戏服务器 (NetworkServer)。
NetworkClient 有一个内部更新函数，它在其中处理来自传输层的事件。这包括异步连接事件、断开连接事件和来自服务器的传入数据。
NetworkManager 有一个 NetworkClient 实例，用于它启动的游戏，但 NetworkClient 可以单独使用。
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