ContentFileUnloadHandle 一个可用于跟踪卸载操作状态的句柄。
开始异步卸载 ContentFile。
如果在加载过程中调用此方法，它将尝试取消加载过程。
即使 ContentFile 加载操作不成功，也必须调用此方法来释放资源。
如果此 ContentFile 正被另一个 ContentFile 用作依赖项，则会引发异常。在这种情况下，必须先卸载另一个文件。
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