Lmdb native txn isolation #6643

Job	Run time
copyright-check	26s
formatting-and-quick-compile	1m 28s
package-assembly	3m 53s
build (21)	17m 6s
build (25)	16m 46s
slow-tests	20m 37s
integration-tests	18m 27s
compile	3m 17s
e2e	5m 45s
	1h 27m 45s

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