Extract code to render the graph #1493

Job	Run time
benchmark-graph	46s
benchmark-default (ruby)	11m 10s
test (head)	9s
test (truffleruby)	15s
test (ruby)	9s
benchmark-default (head)	10m 49s
benchmark-ractor (ruby)	13m 15s
benchmark-default (truffleruby)	26s
benchmark-ractor-only (ruby)	55s
benchmark-ractor (truffleruby)	18s
benchmark-ractor (head)	12m 37s
benchmark-ractor-only (head)	47s
benchmark-ractor-only (truffleruby)	19s
benchmark-run-once	1m 30s
all-tests	3s
	53m 28s

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