roa-tcp 0.5.0-rc

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## Roa-tcp

This crate provides an acceptor implementing `roa_core::Accept` and an app extension.

### TcpIncoming

```
use roa_core::App;
use roa_tcp::TcpIncoming;
use std::io;

# fn main() -> io::Result<()> {
let app = App::new(());
let incoming = TcpIncoming::bind("127.0.0.1:0")?;
let server = app.accept(incoming);
// server.await
Ok(())
# }
```

### Listener

```
use roa_core::App;
use roa_tcp::Listener;
use std::io;

# fn main() -> io::Result<()> {
let app = App::new(());
let (addr, server) = app.listen_on("127.0.0.1:0")?;
// server.await
Ok(())
# }
```