Extract code to render the graph #1497

Job	Run time
test (truffleruby)	1m 0s
test (head)	1m 3s
benchmark-graph	50s
test (ruby)	48s
benchmark-default (head)	10m 54s
benchmark-ractor (head)	12m 42s
benchmark-default (truffleruby)	28s
benchmark-ractor-only (ruby)	55s
benchmark-ractor-only (head)	50s
benchmark-ractor (ruby)	12m 46s
benchmark-ractor-only (truffleruby)	12s
benchmark-ractor (truffleruby)	17s
benchmark-run-once	1m 32s
benchmark-default (ruby)	11m 21s
all-tests	4s
	55m 42s

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