Key4hep build

Make it possible to build with c++20 and switch to new Key4hep build … #4

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Run time

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Job	Run time
build (release, alma9)	2m 51s
build (release, ubuntu22)	2m 48s
build (release, centos7)	3m 34s
build (nightly, alma9)	2m 36s
build (nightly, ubuntu22)	6m 28s
build (nightly, centos7)	6m 14s
	24m 31s