the Stream for AsyncRunner doesn't consume the write queue

[museun]

This is a problem and its because the Stream isn't constantly being polled. We either need to remove the Stream interface or provide another future people can poll to drive the queue.

Also side note, the rate limiter is overly complex and shouldn't be a concern of this crate.

[museun]

To explain further when using the AsyncRunner as a Stream messages won't be written until it reads a message.

[ianbrickbod]

to combat this I've got the slightly dodgy code of:

twitch::say(&mut r,selection).await;
let start = SystemTime::now();
while SystemTime::now().duration_since(start).unwrap() < Duration::from_millis(100){
   r.step().await;
}

At some point I'm going to get tripped up due to latency or something meaning the 100ms is not going to be long enough, but for now it seems ok