perf: Add support for virtual threads #790

Job	Run time
units (8)	39s
units (11)	43s
units (17)	38s
dependencies (17)	36s
windows	1m 5s
units (21)	38s
clirr	36s
lint	34s
javadoc	42s
integration / integration-cassandra (11)	3m 22s
integration / integration-spanner (11)	6m 59s
	16m 32s

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