BluetoothRemoteGATTDescriptor：uuid 属性
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
BluetoothRemoteGATTDescriptor.uuid 只读属性返回特征描述符的 UUID。例如，客户端特征配置描述符的 UUID 是 "00002902-0000-1000-8000-00805f9b34fb"。