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

account_id_	NIMSignalingJoinAndAcceptParam
channel_id_	NIMSignalingJoinAndAcceptParam
custom_info_	NIMSignalingJoinAndAcceptParam
nertc_channel_name_	NIMSignalingJoinAndAcceptParam
nertc_join_room_query_param_	NIMSignalingJoinAndAcceptParam
nertc_token_ttl_	NIMSignalingJoinAndAcceptParam
offline_enabled_	NIMSignalingJoinAndAcceptParam
request_id_	NIMSignalingJoinAndAcceptParam
uid_	NIMSignalingJoinAndAcceptParam