Add new benchmark testing initialize performance #1713

Job	Run time
benchmark-ractor (head)	6m 48s
benchmark-ractor-only (head)	42s
benchmark-graph	45s
test (ruby)	55s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	12m 59s
test (head)	47s
benchmark-run-once	1m 41s
benchmark-default (ruby)	13m 50s
benchmark-default (head)	13m 23s
test (truffleruby)	1m 47s
all-tests	3s
	53m 40s

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