Has user read this message? Omit user for "read by anyone".
Fires once per user per message on first read. Returns unsubscribe.
Wire into sock.ev.on('message-receipt.update', ...) — group/status receipts.
ReadonlysizeWire into sock.ev.on('messages.update', ...) — DM status changes.
{ delivered, read, played }jid lists for a message (read implies delivered).