Feature summary (what you would like to be able to do and where): Whenever the site is a data repository and a returned page is one of the item pages in that data repository's item namepsaces, to turn it into an ItemPage

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution): Right now if I use something like AllPagesGenerator but limited to the Property namespace then it gives me back a bunch of normal Pages. I would like to be able to work with them as a bunch of Items.

Benefits (why should this be implemented?): Allows making working with Wikidata items from page generators easier.