Today the java SDK doesn't provide a iterator on page collections. This should be easy to provide in a further release. [more info](https://github.com/microsoftgraph/msgraph-sdk-design/blob/master/tasks/PageIteratorTask.md) [AB#7704](https://microsoftgraph.visualstudio.com/0985d294-5762-4bc2-a565-161ef349ca3e/_workitems/edit/7704)
