Show/hide Content type and Language filters when using facets.

For Facet Sources we can add "The name of the facet for usage in URLs" and by default these advanced filters(ct and language) have their default key(i.e. type for content types).

We decided that makes no sense to have these filters when we're using facets but anyway if the user wants to use it, then should have the possibility.

So now that we have Facet source as config entity we can configure it from the entity.