Add support for the conversation API #1272

Job	Run time
setup	49s
validate-example (actor)	3m 17s
validate-example (configuration)	1m 45s
validate-example (conversation)	1m 56s
validate-example (crypto)	1m 51s
validate-example (dist-scheduler)	2m 0s
validate-example (grpc-service)	3m 3s
validate-example (hello-world)	2m 1s
validate-example (pubsub)	2m 21s
validate-example (streamsub)	1m 48s
validate-example (service)	2m 45s
validate-example (socket)	1m 9s
validate-example (workflow)	3m 19s
validate-example (workflow-parallel)	1m 45s
	29m 49s

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