output: add telemetry support to OutputPlugin #512

Job	Run time
check / clang-checks	1m 15s
check / editor-config	7s
build-os-matrix	3s
build (oraclelinux:10) / build	1m 57s
rpm-build (oraclelinux:10) / rpm-build	6m 12s
make-tests (oraclelinux:10) / tests	1m 47s
ipfix-elements-check / ipfix-elements-checks	22s
rpm-install (oraclelinux:10) / rpm-install	1m 10s
	12m 53s

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