Announcing better_tokio_select: tokio::select! that can be formatted by rustfmt

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The tokio::select! macro uses a custom DSL, which means it can't be formatted by rustfmt, which is a huge problem!

tokio::select! {
    res = reader.read(&mut buf), if can_read => {
        let n = res?;
        if n == 0 { return Ok(()); }
        writer.write_all(&buf[..n]).await?;
    }

    _ = shutdown.recv() => {
        return Ok(());
    }
}

This macro, tokio_select from the better_tokio_select crate I just released, can do everything that tokio::select! can, but it can also be formatted by rustfmt, because the syntax is 100% valid Rust:

tokio_select!(match .. {
    .. if let Ok(n) = reader.read(&mut buf) && can_read => {
        let n = res?;
        if n == 0 { return Ok(()); }
        writer.write_all(&buf[..n]).await?;
    }

    .. if let _ = shutdown.recv() => {
        return Ok(())
    }
})
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