get_transactions should support a cursor so all transactions can be retrieved, not just last n records.

[rustyconover]

When using get_transactions it seems to only return a fixed window of results, such as the last n.

If I'm working with many streams I may have more transactions than fit into that window of records. At this time there doesn't seems to be a way to have a cursor through the transaction records such that I can retrieve all of them in a reliable fashion from a fixed point in time.

By not having this I need to rely on the performance trackers per stream which not as granular. If you need me to clarify my use case I'm happy to.

[microprediction]

They aren't there probably due to the TTL. However there are longer skinnier transaction streams (e.g. by stream) that can be pulled.