[ros2] lint the pcl_ros code base to try and get a green build :) (#406)

* Lint!

* Fix flake8 errors

* Fix clang-tidy errors

* Remove [[maybe_unused]]

pcl_ros/tools/bag_to_pcd.cpp

@@ -49,11 +49,13 @@ Cloud Data) format.
 #include <pcl/common/io.h>
 #include <pcl/io/pcd_io.h>
 #include <pcl_conversions/pcl_conversions.h>
+
 #include <tf/transform_listener.h>
 #include <tf/transform_broadcaster.h>
-#include <boost/filesystem.hpp>
 #include <sstream>
 #include <string>
+
+#include <boost/filesystem.hpp>
 #include "pcl_ros/transforms.hpp"
 
 typedef sensor_msgs::PointCloud2 PointCloud;

pcl_ros/tools/pcd_to_pointcloud.cpp

@@ -43,21 +43,18 @@
 
  **/
 
-// STL
+#include <pcl/common/io.h>
+#include <pcl/io/pcd_io.h>
+#include <pcl/point_types.h>
+#include <pcl_conversions/pcl_conversions.h>
+
 #include <chrono>
 #include <string>
 #include <thread>
 
-// PCL
-#include <pcl/common/io.h>
-#include <pcl/io/pcd_io.h>
-#include <pcl/point_types.h>
-
-// ROS core
 #include <rclcpp/rclcpp.hpp>
 #include "rclcpp_components/register_node_macro.hpp"
 #include <sensor_msgs/msg/point_cloud2.hpp>
-#include <pcl_conversions/pcl_conversions.h>
 
 namespace pcl_ros
 {