search: record_viewed signal move to new package
search: record_viewed signal move to new package

* INCOMPATIBLE Moves 'record-viewed' signal to `invenio_records`
  package.

Signed-off-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>

tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio