refactor!: unify env/scenes API across robots and restructure assets #206

Job	Run time
pythonpackage	2m 38s
check-paths	8s
build_cpp_extensions (rcs_robotics_library)	3m 12s
build_cpp_extensions (rcs_panda)	2m 56s
build_cpp_extensions (rcs_so101)	4m 22s
build_extensions (rcs_xarm7)	2m 18s
build_cpp_extensions (rcs_fr3)	3m 41s
build_extensions (rcs_usb_cam)	2m 12s
build_extensions (rcs_robotiq2f85)	2m 3s
build_extensions (rcs_realsense)	2m 5s
build_extensions (rcs_tacto)	2m 26s
	28m 1s

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