Add TreeView.LeadingAction sub-component (#4546)

* add grid area for drag handle when data-drag-and-drop is true

* add test to verify dnd attribute

* css updates

* add docs

* test(vrt): update snapshots

* Sid/treeview leading action (#4569)

* wip: leading action slot

* clean up a little

* change from prop to subcomponent

* remove outdated test

* spacer should come before leadingAction

* merge snapshots from main

* merge package-lock from main

* add visual tests

* use IconButton for leadingAction

* add example of drag handle on hover

* Create tame-nails-live.md

* test(vrt): update snapshots

* change LeadingActio type to React.FC<TreeViewVisualProps> and accept children

* change LeadingAction of type React.FC<TreeViewVisualProps>

* typo

* add `variant="invisible"` to icon button in stories

* add leadingActionId and aria-hidden to LeadingAction subcomponent

* remove `leadingActionId` to describe the tree view item

* remove unused leadingActionId

* remove docs from changeset

---------

Co-authored-by: ayy-bc <[email protected]>
Co-authored-by: Siddharth Kshetrapal <[email protected]>
Co-authored-by: siddharthkp <[email protected]>

Author: ayy-bc

.changeset/tame-nails-live.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+TreeView: Add support for `TreeView.LeadingAction`