Add gRPC topic producer endpoint - Java side #2519

Job	Run time
End to End tests (Python, python)	14m 40s
End to End tests (Other, other)	14m 40s
CLI End to End tests	12m 56s
Unit tests (Runtime)	6m 44s
Unit tests (Runtime IT)	13m 39s
Unit tests (Deployer)	7m 14s
Unit tests (Api Gateway)	4m 1s
Unit tests (Control plane)	3m 48s
Unit tests (Other)	12m 11s
Unit tests (Style)	4m 13s
	1h 34m 6s

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