Apply a set of metadata at once

From part of the discussion here: https://app.element.io/#/room/#eikek_docspell:gitter.im/$Jhva9EIZEHSM3wFPLoTEpEYqlOOLiS9hAn74qq90wKM

Idea is to allow to apply sets of metadata at once. Could work similar to bookmarks: define a set of metadata (and values), like tags, custom fields etc and store them under a name. Then the edit view can list those where a click applies all at once to the item.

Relates to #1265