Add messages to help with horizon-imp cli arg usage for #744 #1564

Job	Run time
stylecheck	20s
build-debug	15m 10s
build-arch (all)	15m 46s
build-opensuse (all)	13m 7s
build (ubuntu:focal, g++, gcc, all)	15m 17s
build-arch (horizon.so)	4m 55s
build-opensuse (horizon.so)	5m 7s
build-pr-review	3m 38s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 56s
build (ubuntu:jammy, g++, gcc, all)	13m 8s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 18s
build (ubuntu:mantic, g++, gcc, all)	13m 27s
build (ubuntu:mantic, g++, gcc, horizon.so)	4m 1s
build (ubuntu:noble, g++, gcc, all)	15m 24s
build (ubuntu:noble, g++, gcc, horizon.so)	5m 0s
build (debian:bullseye, g++, gcc, all)	13m 4s
build (debian:bullseye, g++, gcc, horizon.so)	4m 19s
build (debian:bookworm, clang, clang, all)	13m 46s
build (debian:bookworm, clang, clang, horizon.so)	4m 29s
build (debian:bookworm, g++, gcc, all)	14m 57s
build (debian:bookworm, g++, gcc, horizon.so)	4m 31s
	3h 8m 40s

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