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Support running Spinel as a benchmark target #2125

Job	Run time
benchmark-run-once	58s
test (head)	53s
test (ruby)	58s
benchmark-ractor (head)	18m 56s
benchmark-graph	40s
benchmark-ractor-only (head)	1m 50s
benchmark-default (ruby)	12m 29s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	7m 1s
benchmark-default (head)	10m 40s
test (truffleruby)	1m 31s
all-tests	3s
	55m 59s