Refactor shard_consumer and handle expired iterators #50
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This moves fetching records into a goroutine to try and abstract the logic in preparation for enhanced fanout. It also moves the commit loop into a goroutine to try and simplify
consume()a bit. Line 248 also adds handling for expired iterators.FugiTech#1 shows the enhanced fanout changes which rely on this PR. Let me know if you'd prefer to review them together.