feat: Make Python node the default executable for elevation_mapping_cupy

- Change executable from 'elevation_mapping_node' to 'elevation_mapping_node.py' in launch files
- Use pure Python implementation instead of C++ wrapper to avoid API mismatches
- Ensures compatibility with latest Python API changes

Author: Idate96

elevation_mapping_cupy/launch/elevation_mapping.launch.py

@@ -58,7 +58,7 @@ def generate_launch_description():
     # Define nodes
     elevation_mapping_node = Node(
         package=package_name,
-        executable='elevation_mapping_node',
+        executable='elevation_mapping_node.py',
         name='elevation_mapping_node',
         output='screen',
         parameters=[

elevation_mapping_cupy/launch/elevation_mapping_cupy.launch.py

@@ -11,7 +11,7 @@ def generate_launch_description():
         launch_ros.actions.SetParameter(name='use_sim_time', value=True),
         Node(
             package='elevation_mapping_cupy',
-            executable='elevation_mapping_node',
+            executable='elevation_mapping_node.py',
             name='elevation_mapping',
             parameters=[
                 PathJoinSubstitution([