Merge pull request 'Move GCHandshake trait to proto-common' (#1) from zargovv/proto:main into main

Reviewed-on: https://codeberg.org/steam-vent/proto/pulls/1

common/src/lib.rs

@@ -103,3 +103,13 @@ pub trait JobMultiple {
     /// If the job has completed
     fn completed(&self) -> bool;
 }
+
+pub trait GCHandshake {
+    type Hello: RpcMessageWithKind + Send;
+
+    type Welcome: RpcMessageWithKind + Send;
+
+    fn app_id(&self) -> u32;
+
+    fn hello(&self) -> Self::Hello;
+}