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

channel_ext_	NIMSignalingChannelInfo
channel_id_	NIMSignalingChannelInfo
channel_name_	NIMSignalingChannelInfo
channel_type_	NIMSignalingChannelInfo
create_timestamp_	NIMSignalingChannelInfo
creator_id_	NIMSignalingChannelInfo
expire_timestamp_	NIMSignalingChannelInfo
invalid_	NIMSignalingChannelInfo
nertc_join_room_resp_	NIMSignalingChannelInfo
nertc_token_	NIMSignalingChannelInfo
nertc_token_ttl_	NIMSignalingChannelInfo