chore(api)!: added achievement service

api/proto/task.proto

@@ -3,6 +3,7 @@ syntax = "proto3";
 package task;
 
 import "google/protobuf/timestamp.proto";
+import "google/protobuf/empty.proto";
 
 option go_package = "pkg/api/task";
 
@@ -10,7 +11,7 @@ service TaskService {
   rpc CreateTask(Task) returns (Task);
   rpc GetTask(GetTaskRequest) returns (Task);
   rpc EditTask(Task) returns (Task);
-  rpc DeleteTask(DeleteTaskRequest) returns (DeleteTaskResponse);
+  rpc DeleteTask(DeleteTaskRequest) returns (google.protobuf.Empty);
   rpc ListCompetitionTasks(ListCompetitionTasksRequest) returns (ListCompetitionTasksResponse);
   rpc GetTaskAttachments(GetTaskAttachmentsRequest) returns (GetTaskAttachmentsResponse);
 }
@@ -48,9 +49,6 @@ message GetTaskRequest {
 message DeleteTaskRequest {
   string task_id = 1;
 }
-message DeleteTaskResponse {
-  bool success = 1;
-}
 
 message ListCompetitionTasksRequest {
   string competition_id = 1;