Ruby

Add --show-stats option (for experiment) #1290

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (truffleruby)	40s
build (4.0)	41s
build (truffleruby-head)	38s
build (head)	43s
build (3.4)	58s
build (3.3)	53s
	4m 37s

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