[ray_client]: Support runtime_context as metadata (#13428)

src/ray/protobuf/ray_client.proto

@@ -138,6 +138,7 @@ message ClusterInfoType {
     NODES = 1;
     CLUSTER_RESOURCES = 2;
     AVAILABLE_RESOURCES = 3;
+    RUNTIME_CONTEXT = 4;
   }
 }
 
@@ -149,10 +150,18 @@ message ClusterInfoResponse {
   message ResourceTable {
     map<string, double> table = 1;
   }
+
+  message RuntimeContext {
+    bytes job_id = 1;
+    bytes node_id = 2;
+    bool capture_client_tasks = 3;
+  }
+
   ClusterInfoType.TypeEnum type = 1;
   oneof response_type {
     string json = 2;
     ResourceTable resource_table = 3;
+    RuntimeContext runtime_context = 4;
   }
 }