Creates a Stream containing the result of this future.
The stream will produce single data or error event containing the completion result of this future, and then it will close with a done event.
If the future never completes, the stream will not produce any events.
Source
/**
* Creates a [Stream] containing the result of this future.
*
* The stream will produce single data or error event containing the
* completion result of this future, and then it will close with a
* done event.
*
* If the future never completes, the stream will not produce any events.
*/
Stream<T> asStream();