Optional ReadonlycomponentsThe components of a card, held to the limits of checkComponents before storing.
Optional Readonlykindtext (default) or card (a message with components).
Optional ReadonlyreplyThe message it answers, if any.
Optional ReadonlyrunThe run the reply belongs to (inside a run the adapter passes it).
Options of Outbox.sendMessage; each maps to a member of
MessageCreate.