feat: Add asJavaStream to Sink #3993

Job	Run time
Check / Code Style	1m 39s
Check / Tests	33m 3s
Pekko Classic Remoting Tests (cluster/test distributed-data/test cluster-tools/test cluster-metri...	10m 29s
Java 21 Extra Tests (including all tests that need Java 9+)	3m 5s
	48m 16s

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