create static method
Create a new Envelope with the given routing metadata.
sender is the ID of the message sender.
receiver is the ID of the message receiver (user/group).
time is the message timestamp (defaults to current time if null).
Returns a new Envelope instance.
Implementation
static Envelope create({required ID sender, required ID receiver, DateTime? time}) {
final helper = sharedMessageExtensions.envelopeHelper;
return helper!.createEnvelope(sender: sender, receiver: receiver, time: time);
}