Add hinclude alternative or esi alternative component

[alexander-schranz]

We can use a fragment_uri to load user specific data over ajax. We should have a deeper look at the implementation of @martinlagler in Kügö where it also supports lazy loading.

Something like:

<div id="{{ prepare_component('ajax-include') }}" data-uri="{{ fragment_uri(controller(...)) }}" aria-busy="true"></div>

See also: sulu/web-twig#10