Dedicated `rep_tiers` class #894

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 44s
macOS [UBSAN] [lmdb \| clang]	31m 54s
Linux [ASAN] [lmdb \| clang]	36m 28s
macOS [ASAN] [lmdb \| clang]	31m 38s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 31s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	29m 44s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	39m 6s
macOS [UBSAN] [rocksdb \| clang]	37m 42s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	40m 2s
macOS [ASAN] [rocksdb \| clang]	40m 23s
Linux [UBSAN] [rocksdb \| clang]	45m 58s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	45m 49s
Linux [ASAN] [rocksdb \| clang]	49m 21s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	52m 58s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 34m 46s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	46m 22s
	11h 40m 26s

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