Function read_exact_with_timeout 

pub async fn read_exact_with_timeout<S, B>(
    stream: &mut S,
    buf: B,
    duration: Option<Duration>,
) -> Result<BufResult<(), B>>
where
    S: AsyncRead + Unpin,
    B: IoBufMut,

Execute an async read_exact operation with a timeout.

Reads exactly the full buffer or returns an error.