Add `time_value` (#25) #123

Job	Run time
style_check	18s
xcode_test (13.4.1)	2m 10s
old_xcode (1.33.0, 12.5.1)	3m 20s
xcode_test (14.2.0)	1m 19s
target_test (aarch64-apple-darwin)	50s
old_xcode (stable, 12.5.1)	57s
target_test (aarch64-apple-ios)	1m 55s
target_test (aarch64-apple-ios-sim)	40s
target_test (x86_64-apple-ios)	47s
	12m 16s

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