[pulsar-storm] provide auto-unsubscribe option in pulsar-spout #4238
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Motivation
We have multiple customer ask where they have usecase to unsubscribe subscription when spout closes and topology is down.
many times user uses pulsar-spout to interact with pulsar and wants to process messages without loosing them on the topic in case ack-failure. But user wants unsubscribe from the topic once the topology is going down. Right now, user has to implement custom logic to unsubscribe while closing the spout so, if pulsar-spout has this option then user can directly utilize it.