Add per-bucket election limiter #1920

Job	Run time
macOS [UBSAN] [lmdb \| clang]	39m 27s
macOS [ASAN] [lmdb \| clang]	30m 7s
macOS [TSAN] [lmdb \| clang]	32m 55s
macOS [UBSAN] [rocksdb \| clang]	41m 25s
macOS [ASAN] [rocksdb \| clang]	41m 55s
macOS [TSAN] [rocksdb \| clang]	53m 47s
Linux [UBSAN] [lmdb \| clang]	41m 51s
Linux [ASAN] [lmdb \| clang]	41m 2s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	43m 56s
Linux [TSAN] [lmdb \| clang]	39m 34s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	40m 17s
Linux [UBSAN] [rocksdb \| clang]	46m 6s
Linux [ASAN] [rocksdb \| clang]	56m 25s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	52m 10s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	49m 13s
	10h 50m 10s

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