Hybrid mode for infinite paging

[wyuenho]

Infinite paging often involves cases where previously fetched pages need to have their models retained for operations later on. Storing previously fetched pages in fullCollection will satisfy this use case. So in essence, this mode will enable fetching page by page from the server, but storing the page on the client side once fetched. Paging backward will be done on the client side, but paging forward will use server-side mode.