Add function: get_versionstamp_incarnation() #2743

Job	Run time
tests (fdb-record-layer-lucene)	14m 58s
tests (fdb-extensions)	24m 42s
style	14m 16s
tests (fdb-record-layer-core)	20m 58s
other-tests	6m 47s
tests (yaml-tests)	20m 23s
coverage	55s
	1h 42m 59s

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