Reset peer's receive timeout when a message is received

* Make advance_clock more realistic by waking timers in order,
  instead of all at once.
* Don't advance the clock when simulating random delays.

Co-Authored-By: Keith Simmons <keith@zed.dev>
Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/rpc/src/proto.rs

@@ -283,6 +283,7 @@ pub struct MessageStream<S> {
     encoding_buffer: Vec<u8>,
 }
 
+#[derive(Debug)]
 pub enum Message {
     Envelope(Envelope),
     Ping,