GraalVM smoke tests

Expose metrics for `pending acquire` operation latency #35

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Run time

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Job	Run time
build (ubuntu-20.04, native)	3m 1s
build (ubuntu-20.04, nio)	3m 3s
build (macos-11, native)	4m 44s
build (macos-11, nio)	4m 33s
build (windows-2022, nio)	4m 1s
	19m 22s