feat: added ping functionality

pkg/plug/grpc.go

@@ -2,6 +2,7 @@ package plug
 
 import (
 	"context"
+	"google.golang.org/protobuf/types/known/timestamppb"
 	"log"
 
 	"git.dragse.it/anthrove/otter-space-sdk/pkg/graph"
@@ -92,3 +93,11 @@ func (s *server) removeTask(taskID string) {
 	fn()
 	delete(s.ctx, taskID)
 }
+
+func (s *server) Ping(_ context.Context, request *gRPC.PingRequest) (*gRPC.PongResponse, error) {
+	response := gRPC.PongResponse{
+		Message:   request.Message,
+		Timestamp: timestamppb.Now(),
+	}
+	return &response, nil
+}