Add support for the conversation API #1244

Job	Run time
setup	4m 10s
validate-example (actor)	2m 41s
validate-example (configuration)	1m 36s
validate-example (conversation)	1m 33s
validate-example (crypto)	1m 44s
validate-example (dist-scheduler)	1m 6s
validate-example (grpc-service)	2m 14s
validate-example (hello-world)	1m 7s
validate-example (pubsub)	1m 57s
validate-example (streamsub)	1m 3s
validate-example (service)	2m 4s
validate-example (socket)	1m 3s
validate-example (workflow)	1m 33s
validate-example (workflow-parallel)	1m 7s
	24m 58s

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