Add gRPC topic producer endpoint - Java side #2521

Job	Run time
End to End tests (Python, python)	21m 23s
End to End tests (Other, other)	16m 58s
CLI End to End tests	10m 50s
Unit tests (Runtime)	6m 41s
Unit tests (Runtime IT)	19m 0s
Unit tests (Deployer)	7m 31s
Unit tests (Api Gateway)	4m 22s
Unit tests (Control plane)	4m 7s
Unit tests (Other)	3m 16s
Unit tests (Style)	4m 10s
	1h 38m 18s

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