GraalVM smoke tests

Add info for `HTTP/2` connection pool metrics #59

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Run time

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Job	Run time
build (ubuntu-20.04, native)	3m 9s
build (ubuntu-20.04, nio)	2m 55s
build (macos-11, native)	7m 12s
build (macos-11, nio)	5m 17s
build (windows-2022, nio)	4m 12s
	22m 45s