成员的完整列表，这些成员属于 NIMQChatChannelGetChannelsParam,包括所有继承而来的类成员

cb	NIMQChatChannelGetChannelsParam
channel_ids	NIMQChatChannelGetChannelsParam
channel_ids_count	NIMQChatChannelGetChannelsParam
user_data	NIMQChatChannelGetChannelsParam