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

Cargo.lock

@@ -7719,7 +7719,6 @@ dependencies = [
  "env_logger",
  "flexible-transcript",
  "hex",
- "jsonrpsee",
  "log",
  "once_cell",
  "rand_core",
@@ -7727,9 +7726,6 @@ dependencies = [
  "serai-db",
  "serai-env",
  "serai-primitives",
- "serde",
- "serde_json",
- "simple-request",
  "tokio",
  "zeroize",
 ]