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Add multi-Ractor memory benchmarks #2119

Job	Run time
benchmark-ractor (head)	6m 58s
test (truffleruby)	1m 21s
test (head)	53s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	12m 4s
benchmark-graph	1m 1s
benchmark-default (ruby)	12m 31s
benchmark-run-once	1m 14s
benchmark-ractor-only (head)	56s
test (ruby)	52s
benchmark-default (head)	13m 24s
all-tests	2s
	51m 16s