feat: gRPC endpoint support #310

Job	Run time
Basic checks	1m 2s
Build and publish artifacts and plugins locally	2m 2s
Check service docker image contents	58s
Maven samples (shopping-cart-quickstart, true)	1m 0s
Run annotation processor tests	1m 25s
Maven samples (choreography-saga-quickstart, true)	1m 3s
Run sbt test	2m 58s
Maven samples (doc-snippets, false)	37s
Maven samples (view-store, true)	1m 13s
Maven samples (spring-dependency-injection, true)	46s
Maven samples (event-sourced-customer-registry, true)	52s
Maven samples (event-sourced-counter-brokers, docker compose up -d, true)	1m 53s
Maven samples (event-sourced-customer-registry-subscriber, true, ./start-upstream.sh)	1m 23s
Maven samples (key-value-counter, true)	46s
Maven samples (key-value-shopping-cart, true)	41s
Maven samples (key-value-customer-registry, true)	54s
Maven samples (tracing, false)	44s
Maven samples (reliable-timers, true)	57s
Maven samples (transfer-workflow, true)	1m 1s
Maven samples (transfer-workflow-compensation, true)	52s
	23m 7s

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