Alternative QueryController approach

[bdunogier]

Applies the concepts from ezsystems/ezpublish-kernel#1473

Updates the blog view to use the QueryController.

[clash82]

Awesome! can't wait to see this in action with pagination support :)

[andrerom]

Any POV on how we should deal with Paging? Got feedback that PagerFanta is not really good compared to what we had in legacy, which was purely template based. But unsure on which reason that would be.

[crevillo]

@andrerom Probably PagerFanta can require more work if you want to theme your paginations, but other than that, i'm really happy with it :)
Edit: For one of our sites we did a custom Pagination extending from one of those offered by PagerFanta. Probably could be an option create an eZPublishPaginator like it...

[bdunogier]

I don't think we can really skip some sort of support for a Pager here.

The fact that PagerFanta might not be right for everybody can be an issue. One way would be to make that extensible to some extent. It shouldn't be very complicated: the code that builds the actual result variable based on the search results can be refactored into an external service. We must support both pager & not pager (as it is, semantically, a QueryController option), and we should make sure that the pager implementation can easily be swapped with another one, by means of service container aliasing.