kafka protocol: add decodeNextRecordOffset #6607

Job	Run time
prepare pre-build environment for tests	18s
build-hstream-admin-store	1m 51s
build-ghc-9.2.8	32m 1s
test-ghc-9.2.8	4m 21s
integration-tests-9.2.8	19m 39s
deploy-to-minikube-ghc-${{ matrix.ghc }}	0s
integration-tests-rqlite-9.2.8	21m 25s
integration-tests-kafka-9.2.8	12m 15s
integration-tests-kafka-rqlite-9.2.8	12m 1s
distributed-tests-9.2.8	5m 6s
	1h 48m 57s

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