Wraps a future into a MaybeDone

Examples

# futures::executor::block_on(async {
use core::pin::pin;

use futures::future;

let future = future::maybe_done(async { 5 });
let mut future = pin!(future);
assert_eq!(future.as_mut().take_output(), None);
let () = future.as_mut().await;
assert_eq!(future.as_mut().take_output(), Some(5));
assert_eq!(future.as_mut().take_output(), None);
# });