Equivalent to Rails' find_in_batches

It would be really helpful to have a method that is equivalent to `.All(ctx)` but that returns batches of records that can be iterated over. This would be useful for backfill scripts where I don't want to risk hitting a OOM loading all the data from the DB.

Rails has the `find_in_batches` method that nicely supports this: https://apidock.com/rails/ActiveRecord/Batches/find_in_batches