perf: Add support for virtual threads #810

Job	Run time
windows	1m 11s
units (11)	43s
units (17)	40s
units (21)	41s
units (8)	46s
dependencies (17)	50s
javadoc	40s
lint	37s
clirr	31s
integration / integration-spanner (11)	6m 59s
integration / integration-cassandra (11)	3m 10s
	16m 48s

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