WIP: Native sorting in API / GraphQL requests

[plyhun]

Abstract

Currently Mesh lacks sorting possibilities on data fetch on both REST API targets and GraphQL. Here comes an attempt to fulfill this need. Not yet finished.

Checklist

General

• [x] Added abstract that describes the change
• [ ] Added changelog entry to /CHANGELOG.adoc
• [ ] Ensured that the change is covered by tests
• [ ] Ensured that the change is documented in the docs

On API Changes

• [x] Checked if the changes are breaking or not
• [ ] Added GraphQL API if applicable
• [x] Added Elasticsearch mapping if applicable