Add support for the conversation API (#646) #1280

Job	Run time
setup	5m 26s
validate-example (actor)	2m 45s
validate-example (configuration)	1m 20s
validate-example (conversation)	1m 32s
validate-example (crypto)	1m 9s
validate-example (dist-scheduler)	1m 3s
validate-example (grpc-service)	2m 9s
validate-example (hello-world)	1m 11s
validate-example (pubsub)	1m 53s
validate-example (streamsub)	1m 2s
validate-example (service)	2m 19s
validate-example (socket)	45s
validate-example (workflow)	1m 33s
validate-example (workflow-parallel)	58s
	25m 5s

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