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

client_id	NIMDeleteMessagesSelfParam
ext	NIMDeleteMessagesSelfParam
from_account	NIMDeleteMessagesSelfParam
server_id	NIMDeleteMessagesSelfParam
time	NIMDeleteMessagesSelfParam
to_account	NIMDeleteMessagesSelfParam
to_type_	NIMDeleteMessagesSelfParam