Transformer kinesis: Recover from losing lease to a new worker

[istreeter]

This is similar to snowplow/enrich#649 where it is explained in detail.

The newer versions of transformer-kinesis are able to scale up to multiple concurrent instances. Therefore it must be resilient to autoscaling events, in which KCL workers steal leases from each other.

The simple solution is to catch and handle a ShutdownException when checkpointing a record