Make data::data_channel::DataChannel implement tokio::io AsyncRead and AsyncWrite traits

[tedsteen]

For better interoperability with tokio

[melekes]

@tedsteen did you end up implementing it yourself? if so, can you share the code? I'm currently doing the same thing.

[tedsteen]

@tedsteen did you end up implementing it yourself? if so, can you share the code? I'm currently doing the same thing.

No I didn't, would still be a nice addition imo

[melekes]

I will work on that then

[melekes]

Opened webrtc-rs/sctp#9

[melekes]

Sorry, one more thing needs to be done - webrtc-rs/data#4. Once it's merged, this issue can be closed.