Use chrono timestamps in ascending bootstrap code #2131

Job	Run time
Linux [UBSAN] [lmdb \| clang]	41m 30s
macOS [UBSAN] [lmdb \| clang]	35m 42s
Linux [ASAN] [lmdb \| clang]	38m 1s
macOS [ASAN] [lmdb \| clang]	31m 9s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 11s
macOS [TSAN] [lmdb \| clang]	29m 44s
Linux [TSAN] [lmdb \| clang]	41m 20s
macOS [UBSAN] [rocksdb \| clang]	42m 55s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 22s
macOS [ASAN] [rocksdb \| clang]	41m 36s
Linux [UBSAN] [rocksdb \| clang]	52m 39s
macOS [TSAN] [rocksdb \| clang]	53m 12s
Linux [ASAN] [rocksdb \| clang]	53m 35s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 20s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	55m 21s
	10h 50m 37s

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