feat(yamux): rename symbols to follow module-based naming convention

Implements our naming convention for the `libp2p-yamux` crate.

Related: #2217.

Pull-Request: #3852.

examples/distributed-key-value-store/src/main.rs

@@ -66,7 +66,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     let transport = tcp::async_io::Transport::default()
         .upgrade(Version::V1Lazy)
         .authenticate(noise::Config::new(&local_key)?)
-        .multiplex(yamux::YamuxConfig::default())
+        .multiplex(yamux::Config::default())
         .boxed();
 
     // We create a custom network behaviour that combines Kademlia and mDNS.