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Add opt-in Ractor-local GC metrics to the Ractor harness #2086

Job	Run time
benchmark-graph	3m 55s
test (head)	1m 7s
benchmark-ractor-only (head)	36s
benchmark-ractor (head)	6m 43s
benchmark-run-once	1m 22s
benchmark-default (head)	14m 18s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	9m 2s
benchmark-default (ruby)	12m 7s
test (ruby)	49s
test (truffleruby)	1m 20s
all-tests	5s
	51m 24s