Add `Process::Status#description` #13576

Job	Run time
check_format	1m 40s
x86_64-gnu-test	37m 22s
x86_64-gnu-test-preview_mt	5m 45s
x86_64-gnu-test (FLAGS=-Dwithout_ffi USE_PCRE1=true, 1.0.0)	33m 42s
x86_64-musl-test	38m 31s
	1h 57m 0s

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