Add per-bucket election limiter #1913

Job	Run time
Linux [UBSAN] [lmdb \| clang]	41m 5s
Linux [ASAN] [lmdb \| clang]	41m 58s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	42m 19s
Linux [TSAN] [lmdb \| clang]	42m 19s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 12s
Linux [UBSAN] [rocksdb \| clang]	48m 28s
Linux [ASAN] [rocksdb \| clang]	48m 43s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 3s
macOS [UBSAN] [lmdb \| clang]	35m 53s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 47s
macOS [ASAN] [lmdb \| clang]	29m 50s
macOS [TSAN] [lmdb \| clang]	33m 39s
macOS [UBSAN] [rocksdb \| clang]	41m 46s
macOS [ASAN] [rocksdb \| clang]	36m 43s
macOS [TSAN] [rocksdb \| clang]	50m 33s
	10h 41m 18s

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