In this commit we add a new helper method in the sqldb package:
ExecuteCollectAndBatchWithSharedDataQuery. This can be used to paginate
through items in the database while at the same time performing batch
data collection for those items.
We rename this helper along the config types & helper types for it
because the word "page" is used more often in the context of paging
through results using an offset and limit whereas this helper is
specifically used to split up the slice in queries of the form
"WHERE x in []slice". We do this rename so that there is mimimal
confusion in contexts where we use batching along with actual paging.
The config struct is also renamed to QueryConfig in preparation for it
holding more config options.
Along with a test for it. This helper will allow us to easily create a
pagination wrapper for queries that will make use of the new
/*SLICE:<field_name>*/ directive. The next commit will add a test
showing this.
