Changed URDF to add hsai laser and realsense camer

[aaggj]

Added in the urdf the tf of realsense camera and hsai laser in order to avoid publishing a tf static transform

[aaggj]

Added hsai laser and realsense camera positions to urdf

[Juancams]

Hello!!

I'll tell you the errors I've seen:

• I don't know the reason why you change base_link -> base.
• The parents you put do not exist within the urdf.
• Load the lidar model (some generic) and the realsense model, please.

Please modify the changes I request and verify that everything works correctly.

Thank you so much!!