Move message-queue to a fully binary representation (#454)

* Move message-queue to a fully binary representation

Additionally adds a timeout to the message queue test.

* coordinator clippy

* Remove contention for the message-queue socket by using per-request sockets

* clippy

coordinator/src/tests/mod.rs

@@ -35,10 +35,10 @@ impl Processors for MemProcessors {
     let processor = processors.entry(network).or_insert_with(VecDeque::new);
     processor.push_back(msg.into());
   }
-  async fn recv(&mut self, _: NetworkId) -> Message {
+  async fn recv(&self, _: NetworkId) -> Message {
     todo!()
   }
-  async fn ack(&mut self, _: Message) {
+  async fn ack(&self, _: Message) {
     todo!()
   }
 }