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Add multi-Ractor memory benchmarks #2122

Job	Run time
benchmark-ractor-only (head)	1m 23s
test (ruby)	53s
benchmark-default (ruby)	12m 49s
benchmark-ractor (head)	18m 53s
benchmark-default (head)	13m 32s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	8m 33s
benchmark-run-once	1m 6s
test (head)	44s
benchmark-graph	42s
test (truffleruby)	1m 44s
all-tests	4s
	1h 0m 23s