chore(api)!: added achievement service

api/proto/competition.proto

@@ -3,6 +3,7 @@ syntax = "proto3";
 package competition;
 
 import "google/protobuf/timestamp.proto";
+import "google/protobuf/empty.proto";
 
 option go_package = "pkg/api/competition";
 
@@ -10,7 +11,7 @@ service CompetitionService {
   rpc CreateCompetition(Competition) returns (Competition);
   rpc GetCompetition(GetCompetitionRequest) returns (Competition);
   rpc EditCompetition(Competition) returns (Competition);
-  rpc DeleteCompetition(DeleteCompetitionRequest) returns (DeleteCompetitionResponse);
+  rpc DeleteCompetition(DeleteCompetitionRequest) returns (google.protobuf.Empty);
   rpc ListCompetitions(ListCompetitionsRequest) returns (ListCompetitionsResponse);
   rpc ChangeCompetitionState(ChangeCompetitionStateRequest) returns (Competition);
 }
@@ -57,9 +58,6 @@ message GetCompetitionRequest {
 message DeleteCompetitionRequest {
   string competition_id = 1;
 }
-message DeleteCompetitionResponse {
-  bool success = 1;
-}
 
 message ListCompetitionsRequest {
   int32 page_size = 1;