Introduce `active_transactions_config` #1850

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 12s
macOS [UBSAN] [lmdb \| clang]	34m 27s
Linux [ASAN] [lmdb \| clang]	39m 41s
macOS [ASAN] [lmdb \| clang]	27m 42s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	42m 57s
macOS [TSAN] [lmdb \| clang]	30m 7s
Linux [TSAN] [lmdb \| clang]	40m 32s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	41m 5s
Linux [UBSAN] [rocksdb \| clang]	1h 21m 21s
Linux [ASAN] [rocksdb \| clang]	1h 20m 29s
macOS [UBSAN] [rocksdb \| clang]	1h 4m 22s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	1h 19m 18s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	1h 21m 38s
macOS [ASAN] [rocksdb \| clang]	1h 8m 52s
macOS [TSAN] [rocksdb \| clang]	1h 11m 28s
	13h 43m 11s

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