getChatMember

suspend fun TelegramBot.getChatMember(chatId: ChatIdentifier, userId: UserId): ChatMember
suspend fun TelegramBot.getChatMember(chat: PublicChat, userId: UserId): ChatMember
suspend fun TelegramBot.getChatMember(chatId: ChatId, user: User): ChatMember
suspend fun TelegramBot.getChatMember(chat: PublicChat, user: User): ChatMember