Use `FILE_SET` to install the headers in `/include` together with the edm4hep library #436

Job	Run time
build-and-test-with-podio (dev3/x86_64-el9-clang16-opt, 20)	10m 32s
build-and-test-with-podio (dev4/x86_64-el9-clang16-opt, 20)	11m 44s
build-and-test-with-podio (dev4/x86_64-centos7-gcc11-opt, 17)	14m 6s
build-and-test-with-podio (LCG_104/x86_64-centos8-gcc11-opt, 17)	8m 41s
	45m 3s

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