feat(exercise): Support `exercise.pipe` option #1203

Job	Run time
macOS-latest (release)	7m 54s
windows-latest (release)	13m 17s
windows-latest (3.6)	9m 40s
ubuntu-20.04 (devel)	4m 57s
ubuntu-20.04 (release)	3m 21s
ubuntu-20.04 (oldrel-1)	4m 36s
ubuntu-20.04 (oldrel-2)	4m 7s
ubuntu-20.04 (oldrel-3)	4m 45s
ubuntu-20.04 (oldrel-4)	4m 25s
Deploy Tutorials to shinyapps.io	0s
	57m 2s

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