Fix room.add() failed when room member more than 40

[lijiarui]

see wechaty/wechaty-puppet-padchat#70

• When member more than 40, use WXInviteChatRoomMember
• When member less than 40, use WXAddChatRoomMember

So add WXInviteChatRoomMember in RPC function.

[huan]

It seems that I had guessed right about the difference between them.

[huan]

no magic number please.

[lijiarui]

WXRoomAddTypeStatus type, maybe need to fill more in the future.

export enum WXRoomAddTypeStatus {
  Done          = 0,
  NeedInvite    = -2012,
  InviteConfirm = -2028,
}