DRYD-1818: Implement image ordering functionality for public browser (#479)

DRYD-1818: Implement image ordering functionality for public browser (#479)

* DRYD-1818: added denormRelatedObjects in DefaultESDocumentWriter to add objectCsid field holding media related objects.

* DRYD-1818: mapped identificationNumber, title as sortable keywords; mapped updatedAt as sortable date field; mapped objectCsid as filterable keyword;

* DRYD-1818: mapped media_common:altText;

* DRYD-1818: fixed trailing comma; updated tenant bindings;