Add a message queue

This is intended to be a reliable transport between the processors and
coordinator. Since it'll be intranet only, it's written as never fail.

Primarily needs testing and a proper ID.

Cargo.lock

@@ -8653,6 +8653,24 @@ dependencies = [
 name = "serai-db"
 version = "0.1.0"
 
+[[package]]
+name = "serai-message-queue"
+version = "0.1.0"
+dependencies = [
+ "ciphersuite",
+ "flexible-transcript",
+ "hex",
+ "jsonrpsee",
+ "lazy_static",
+ "log",
+ "schnorr-signatures",
+ "serai-db",
+ "serai-primitives",
+ "serde",
+ "serde_json",
+ "tokio",
+]
+
 [[package]]
 name = "serai-no-std"
 version = "0.1.0"