Query storage by iterating through chunks by batches.

pkg/chunkenc/lazy_chunk.go

pkg/ingester/instance.go

pkg/iter/iterator.go

pkg/loki/loki.go

pkg/loki/modules.go

pkg/querier/querier.go

pkg/storage/hack/main.go

pkg/storage/iterator.go

pkg/storage/iterator_test.go

pkg/storage/store.go

pkg/storage/store_test.go

pkg/storage/util_test.go