add header to criticscores msg

Author: turtlewizard73

nav2_mppi_controller/msg/CriticScores.msg

@@ -1,2 +1,3 @@
+std_msgs/Header header    # ROS time that this log message was sent.
 std_msgs/String[] critic_names
 std_msgs/Float32[] critic_scores

nav2_mppi_controller/src/controller.cpp

@@ -138,6 +138,7 @@ geometry_msgs::msg::TwistStamped MPPIController::computeVelocityCommands(
       cost_msg.data = critic_costs[i];
       critic_scores_->critic_scores.push_back(std::move(cost_msg));
     }
+    critic_scores_->header.stamp = clock_->now();
     critics_publisher_->publish(std::move(critic_scores_));
   }