Use `FILE_SET` to install the headers in `/include` together with the edm4hep library #447

Job	Run time
build-and-test-with-podio (dev3/x86_64-el9-clang16-opt, 20)	21m 7s
build-and-test-with-podio (dev4/x86_64-el9-clang16-opt, 20)	13m 17s
build-and-test-with-podio (dev4/x86_64-centos7-gcc11-opt, 17)	18m 0s
build-and-test-with-podio (LCG_104/x86_64-centos8-gcc11-opt, 17)	11m 2s
	1h 3m 26s

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