Rework Components query to query multiple dimensions at once

[sosiology]

Situation

• The Components GQL query queries multiple dimension individually as of now.
• The Elements with duplicate predicates (i.e. schema:identifier) figure twice in the result list.

Motivation

• The SPARQL endpoint is generally better performing upon recieving less queries - but optimized ones.

DoD

• [ ] The Components Query makes one SPARQL query over all dimensions at once (instead of multiple)
• [ ] The resultset has no duplicates regardless of duplicate predicates