Enable managed drag and drop for tree data with parentId.

Changes included:

• split the logic to set the parent in the TreeData with parentId strategy
  • We use the "treeNode" field in the RowNode as a slot to store the new tree parent to set during processing
  • in this way we don't reload the parent if there is just a drag and drop event when regrouping after a drag and drop
    • This logic will be reused after when implementing drag and drop with children, switching from the current tree data with children node manager to a common TreeStrategy
  • Fix all the code and types around it
• New drag and drop logic in RowDragFeature that correctly handle switching tree parent and invokes grouping to finalize tree construction