Lapin integration with async-io

This crate integrates lapin with async-io by using async-io's reactor inside of lapin.

``` use async_lapin::*; use lapin::{Connection, ConnectionProperties, Result};

fn main() -> Result<()> { smol::run(async { let addr = std::env::var("AMQPADDR").unwraporelse(|| "amqp://127.0.0.1:5672/%2f".into()); let conn = Connection::connect( &addr, ConnectionProperties::default().withasyncio(|fut| smol::Task::spawn(fut).detach()), ) .await?; // Note the with_async_io() here let channel = conn.create_channel().await?;

    // Rest of your program
})

} ```