add standard task

nodemanager/nodemanager/v1/request_response.proto

@@ -14,6 +14,7 @@ message WorkerMessage {
     DeviceUsageResponse device_usage = 5;
     GoodbyeMessage goodbye_message = 6;
     SubmitResourceMap resource_map = 7;
+    FetchStandardTask fetch_standard_task = 8;
   }
 }
 
@@ -105,6 +106,10 @@ message ProofTaskResult {
   bytes container_pubkey = 4;
 }
 
+message FetchStandardTask {
+  uint64 task_type = 1; // fetch a standard task with special task_type.
+}
+
 message DispatchTaskRequest {
   base.v1.TaskContent task_data = 1;
   string miner = 2;