Add messages to help with horizon-imp cli arg usage for #744 #1598

Job	Run time
stylecheck	16s
build-arch (all)	16m 4s
build (ubuntu:focal, g++, gcc, all)	15m 25s
build-arch (horizon.so)	4m 39s
build-debug	14m 53s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 55s
build-opensuse (all)	15m 9s
build (ubuntu:jammy, g++, gcc, all)	13m 1s
build-opensuse (horizon.so)	5m 42s
build-pr-review	3m 40s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 4s
build (ubuntu:noble, g++, gcc, all)	15m 7s
build (ubuntu:noble, g++, gcc, horizon.so)	5m 15s
build (debian:bullseye, g++, gcc, all)	13m 30s
build (debian:bullseye, g++, gcc, horizon.so)	4m 32s
build (debian:bookworm, clang, clang, all)	14m 1s
build (debian:bookworm, clang, clang, horizon.so)	4m 20s
build (debian:bookworm, g++, gcc, all)	14m 47s
build (debian:bookworm, g++, gcc, horizon.so)	4m 57s
	2h 54m 17s

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