CI: add workflow to check IPFIX element consistency with libfds #232

Job	Run time
check / clang-checks	1m 39s
check / editor-config	6s
build-os-matrix	2s
rpm-build (oraclelinux:9) / rpm-build	6m 4s
build (oraclelinux:9) / build	2m 1s
make-tests (oraclelinux:9) / tests	1m 44s
ipfix-elements-check / ipfix-elements-checks	40s
rpm-install (oraclelinux:9) / rpm-install	1m 21s
	13m 37s

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