Fix move group namespace and demo.launch.py

[vatanaksoytezer]

• Ports Move Group C++ Interface #62, Port "Quickstart in RViz" Tutorial #63 and Moveit_cpp Tutorial #64 to the new ROS2 conventions.
• Fixes Quickstart_in_rivz problem #68.
• Includes move_group namespace fixes (see Remove move_group namespace moveit2#420)
• Add pre-commit

[vatanaksoytezer]

in move_group_interface tutorial when an object is attached the robot, the paths generated are not not collision aware and attached object collides with the object in the scene

[MarqRazz]

@vatanaksoytezer This looks great! Thanks for pushing forward. Does your move_group_interface tutorial plan around the collision object at the end? Mine goes straight through and says success.

[vatanaksoytezer]

Hi @MarqRazz, thanks! Yeah I observed the same behaviour, @JafarAbdi mentioned he would have a look at this and it was likely a bug in moveit2, where they had solved a similar one in moveit1. Maybe you can open an issue and tag me and jafar?