Disable python wrapper for now

The ROS1 wrapper relied on python <-> c++ type casting via message serialization.
A corresponding mechanism doesn't yet exist in ROS2:
- https://answers.ros.org/question/356542/ros2-message-serialization-adapting-types/
- ros2/rclpy#291 (comment)

Author: rhaschke

core/CMakeLists.txt

@@ -25,7 +25,8 @@ add_compile_options(-fvisibility-inlines-hidden)
 set(PROJECT_INCLUDE ${CMAKE_CURRENT_SOURCE_DIR}/include/moveit/task_constructor)
 
 add_subdirectory(src)
-add_subdirectory(python)
+# TODO: enable python wrapper
+#add_subdirectory(python)
 add_subdirectory(test)
 
 install(DIRECTORY include/ DESTINATION include