Add a reliable & ordering over UDP adapter

[lemunozm]

Internal adapter API docs here.

List of candidates:

• laminar: From https://amethyst.rs/. It would be blocked until non-blocking support: issue.
• turbulence: Seems not support using underlying Mio non-blocking sockets 😢
• rudp (candidate) Seems to work with Mio, but is it maintained? Current state? sirkibsirkib/rudp#1
• Some brave rustacean wants to create a new cool and great library that can be agnostic about the underlying udp socket used (std, mio, ...). Similar to how tungstenite-rs manages the TCP stream in its websocket.

The only requirement is that the library must allow using non-blocking with mio support.

Since this kind of adapter is highly configurable (rates, packet size,...) probably it depends first on #54 but the first approach with default configuration can be already done.

[wakuflair]

Hi lemunozm, any good news?

[lemunozm]

Hi, probably the above list is outdated, and the State of the Art regarding this has evolved since I wrote it.

I'm not making active changes in message-io now. But I'm open to reviewing PR with changes.