Add messages to help with horizon-imp cli arg usage for #744 #76

Job	Run time
stylecheck	23s
build-debug	15m 8s
build-arch (all)	15m 42s
build-opensuse (all)	14m 1s
build-arch (horizon.so)	5m 2s
build (ubuntu:focal, g++, gcc, all)	15m 24s
build-opensuse (horizon.so)	5m 38s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 11s
build-pr-review	3m 41s
build (ubuntu:jammy, g++, gcc, all)	13m 13s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 23s
build (ubuntu:mantic, g++, gcc, all)	12m 38s
build (ubuntu:mantic, g++, gcc, horizon.so)	4m 19s
build (ubuntu:noble, g++, gcc, all)	15m 0s
build (ubuntu:noble, g++, gcc, horizon.so)	4m 45s
build (debian:bullseye, g++, gcc, all)	13m 24s
build (debian:bullseye, g++, gcc, horizon.so)	4m 24s
build (debian:bookworm, clang, clang, all)	13m 21s
build (debian:bookworm, clang, clang, horizon.so)	4m 25s
build (debian:bookworm, g++, gcc, all)	14m 54s
build (debian:bookworm, g++, gcc, horizon.so)	4m 42s
	3h 9m 38s

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