Provide engine ObjectMapper via custom interface #593

Job	Run time
build-and-test (17)	1m 12s
build-and-test (20)	1m 23s
javadoc-spotbugs-codeql	1m 16s
build-and-test-nflow-explorer-ng	5m 25s
integration-tests (17, h2)	2m 7s
integration-tests (17, mariadb)	2m 28s
integration-tests (17, postgresql)	2m 25s
integration-tests (17, mysql)	2m 39s
integration-tests (17, sqlserver)	3m 48s
integration-tests (17, db2)	5m 4s
integration-tests (17, oracle)	4m 5s
integration-tests (20, h2)	2m 14s
integration-tests (20, mariadb)	3m 5s
integration-tests (20, postgresql)	2m 13s
integration-tests (20, mysql)	2m 46s
integration-tests (20, sqlserver)	3m 46s
integration-tests (20, db2)	4m 38s
integration-tests (20, oracle)	3m 44s
	54m 18s

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