Use `FILE_SET` to install the headers in `/include` together with the edm4hep library #433

Job	Run time
build-and-test-with-podio (dev3/x86_64-el9-clang16-opt, 20)	8m 27s
build-and-test-with-podio (dev4/x86_64-el9-clang16-opt, 20)	28m 47s
build-and-test-with-podio (dev4/x86_64-centos7-gcc11-opt, 17)	31m 5s
build-and-test-with-podio (LCG_104/x86_64-centos8-gcc11-opt, 17)	22m 29s
	1h 30m 48s

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