[Improvement]: Add option to disable Tree Sorting by index

[dawounit]

Improvement description

It is related to this feature: #2501. It is impossible to disable sorting by index regardless of the tree sorting method (A->Z, Z->A, manual) selected. This causes serious environmental performance problems. I have about 100'000 data objects in one folder. Moving anything to this folder causes all siblings (100'000 objects) to be updated via updateIndexesOfObjectSiblings in "update" action of DataObjectController. Please add new sorting method like "unsorted" or "default" that will not use/update index column from objects table.

[github-actions]

Thanks a lot for reporting the issue. We did not consider the issue as "Pimcore:Priority", "Pimcore:ToDo" or "Pimcore:Backlog", so we're not going to work on that anytime soon. Please create a pull request to fix the issue if this is a bug report. We'll then review it as quickly as possible. If you're interested in contributing a feature, please contact us first here before creating a pull request. We'll then decide whether we'd accept it or not. Thanks for your understanding.