Add new benchmark testing initialize performance #1761

Job	Run time
benchmark-ractor (head)	6m 48s
test (truffleruby)	1m 57s
benchmark-ractor-only (head)	40s
test (head)	54s
test (ruby)	56s
benchmark-run-once	1m 41s
benchmark-graph	39s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 50s
benchmark-default (ruby)	13m 25s
benchmark-default (head)	13m 12s
all-tests	4s
	54m 6s

Provide feedback