Add `--benchmark_human_readable` flag #1676

Job	Run time
ubuntu-22.04.Release.shared.g++	1m 54s
ubuntu-22.04.Release.static.g++	2m 32s
ubuntu-22.04.Release.shared.clang++	2m 43s
ubuntu-22.04.Release.static.clang++	2m 15s
ubuntu-22.04.Debug.shared.g++	1m 55s
ubuntu-22.04.Debug.static.g++	2m 6s
ubuntu-22.04.Debug.shared.clang++	1m 22s
ubuntu-22.04.Debug.static.clang++	2m 3s
ubuntu-20.04.Release.shared.g++	1m 55s
ubuntu-20.04.Release.static.g++	2m 40s
ubuntu-20.04.Release.shared.clang++	1m 52s
ubuntu-20.04.Release.static.clang++	3m 9s
ubuntu-20.04.Debug.shared.g++	1m 44s
ubuntu-20.04.Debug.static.g++	2m 9s
ubuntu-20.04.Debug.shared.clang++	1m 44s
ubuntu-20.04.Debug.static.clang++	2m 8s
macos-latest.Release.shared.g++	3m 23s
macos-latest.Release.static.g++	3m 34s
macos-latest.Release.shared.clang++	3m 3s
macos-latest.Release.static.clang++	3m 36s
macos-latest.Debug.shared.g++	2m 48s
macos-latest.Debug.static.g++	3m 59s
macos-latest.Debug.shared.clang++	2m 59s
macos-latest.Debug.static.clang++	4m 55s
windows-2019.Debug.shared.VS-16-2019	3m 43s
windows-2019.Debug.static.VS-16-2019	4m 35s
windows-2019.Release.shared.VS-16-2019	5m 25s
windows-2019.Release.static.VS-16-2019	4m 2s
windows-2022.Debug.shared.VS-17-2022	8m 31s
windows-2022.Debug.static.VS-17-2022	4m 45s
windows-2022.Release.shared.VS-17-2022	4m 8s
windows-2022.Release.static.VS-17-2022	6m 1s
	1h 43m 38s

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