Add messages to help with horizon-imp cli arg usage for #744 #1596

Job	Run time
stylecheck	1m 0s
build-pr-review	3m 39s
build-arch (all)	15m 43s
build-debug	15m 8s
build-arch (horizon.so)	4m 34s
build (ubuntu:focal, g++, gcc, all)	15m 17s
build-opensuse (all)	15m 19s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 13s
build-opensuse (horizon.so)	6m 25s
build (ubuntu:jammy, g++, gcc, all)	12m 47s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 19s
build (ubuntu:noble, g++, gcc, all)	14m 40s
build (ubuntu:noble, g++, gcc, horizon.so)	4m 39s
build (debian:bullseye, g++, gcc, all)	13m 34s
build (debian:bullseye, g++, gcc, horizon.so)	4m 22s
build (debian:bookworm, clang, clang, all)	13m 48s
build (debian:bookworm, clang, clang, horizon.so)	4m 27s
build (debian:bookworm, g++, gcc, all)	14m 44s
build (debian:bookworm, g++, gcc, horizon.so)	4m 59s
	2h 54m 37s

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