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Support running Spinel as a benchmark target #2090

Job	Run time
benchmark-graph	44s
test (ruby)	52s
test (truffleruby)	1m 30s
benchmark-ractor-only (head)	37s
benchmark-ractor (head)	6m 37s
test (head)	43s
benchmark-run-once	1m 21s
benchmark-default (ruby)	12m 40s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	7m 4s
benchmark-default (head)	12m 38s
all-tests	3s
	44m 49s