Allow splitting large sets of query results into multiple files

[paustint]

Describe the problem you are trying to solve
Feature suggestion: I am currently dealing with querying and deleting hundreds of thousands of junk records from my Org. I have to do this in batches of 40k because of the cell limit in Excel. It would be nice if I could query a larger number of records, and have JetStream download the files in multiple files, split by a record limit that I input.

Alternatively, extend the feature of loading records from a query into an Update to also work for the rest of CRUD. I could just Delete them directly from there.

Complication: Large results are most likely streamed from the server which make splitting this up much more difficult since it actually requires multiple downloads and there isn't a clear way to split in this case.

relates to #746 #881