Introduce `active_transactions_config` #1861

Job	Run time
macOS [UBSAN] [lmdb \| clang]	56m 2s
macOS [ASAN] [lmdb \| clang]	28m 18s
Linux [UBSAN] [lmdb \| clang]	39m 52s
macOS [TSAN] [lmdb \| clang]	31m 14s
Linux [ASAN] [lmdb \| clang]	39m 59s
macOS [UBSAN] [rocksdb \| clang]	1h 10m 49s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	41m 25s
macOS [ASAN] [rocksdb \| clang]	1h 10m 11s
Linux [TSAN] [lmdb \| clang]	40m 53s
macOS [TSAN] [rocksdb \| clang]	1h 12m 46s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	41m 53s
Linux [UBSAN] [rocksdb \| clang]	1h 18m 45s
Linux [ASAN] [rocksdb \| clang]	1h 18m 52s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	1h 19m 58s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	1h 21m 30s
	14h 12m 27s

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