annotate internal links so they are no checked by the linkchecker anymore

[joerghoh]

Feature Request

Right now all internal links created by the linkchecker are post-processed by AEM's linkchecker, and that mostly means validating it. This causes at least 1 repository lookup per link.
When using the LinkBuilder functonality of the Core Components, it would not be necessary to perform this anymore, as this link is already valid.

Describe the solution you'd like

The Core components should annotate internal links with the additional attribute x-cq-linkchecker="skip", which will avoid the validation of the internal link target.