Add `downsampleCloudMsg` function to `noetic-devel` #27

Job	Run time
clang_tidy_check	9m 33s
clang_format_check	41s
catkin_lint_check	7m 22s
black_check	37s
pylint_check	8m 37s
build_check (noetic, main, apt update -q && python3 -m pip install -q -r requirements.txt, true)	8m 41s
build_check (noetic, testing, apt update -q && python3 -m pip install -q -r requirements.txt, true)	8m 3s
	43m 34s

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