* PoC implementation
* Move to controller base
* Implement solution that seems worse, but works better
* Don't require parent key in repository method
* Fix typos
* Add siblings for data type, media type and media
* Add endpoint for template
* Add DocumentType and DocumentBlueprint controllers
* Fix naming
* Fix case if siblings are under root
* Take item ordering into account
not all entities are ordered by sort order
* Add default implementation
* Fix parentkey
* Add tests
* Format optimizations for split view
* Add test covered requirement to description
* Cover positive case and make test case output more readable
* reduce allocations
* Clarify test
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Co-authored-by: Migaroez <geusens@gmail.com>
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