Add support for the conversation API #1238

Job	Run time
setup	4m 15s
validate-example (actor)	2m 38s
validate-example (configuration)	1m 36s
validate-example (conversation)	1m 50s
validate-example (crypto)	1m 26s
validate-example (dist-scheduler)	1m 4s
validate-example (grpc-service)	2m 12s
validate-example (hello-world)	1m 4s
validate-example (pubsub)	1m 59s
validate-example (streamsub)	1m 3s
validate-example (service)	1m 58s
validate-example (socket)	1m 4s
validate-example (workflow)	1m 32s
validate-example (workflow-parallel)	1m 10s
	24m 51s

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