ListView Drop (#3055)
* drop setup
* add root drop indicator
* cleanup stories
* setup root drop target
* fix DropHookOptions type
* cleanup drop hook usage
* cleanup stories
* fix type import
* improve insertion indicator styles
* add style for listview item as drop target
* cleanup item drop on logic
* fix drop key
* lint
* fix useDroppableCollection in useDropHooks
* use listview context in insertion indicator
* handle cell- prefix in ids
* cleanup stories
* lint
* improve getDropTargetFromPoint
* improve indicator styles
* cleanup stories
* cleanup
* fix Drag Into story
* use rowRef in useDroppableItem
* fix item drop target border
* fix story for dragging between lists
* fix lint
* fix lint
* cleanup Drag Into story
* add root drop target styles
* add example for root dropping
* fix lint
* improve insertion indicator style
* raise z-index of insertion indicator
* fix lint
* fix item drop target border style
* cleanup todo
* revert grid cell key change
* refine types
* cleanup
* lint
* formatting
* formatting
* cleanup useDropHooks props
* use context for hooks
* cleanup useDragHooks props spread
* fix css import
* lint
* allow dragging item if disabled
* allow dropping on disabled list items
* remove allowsDraggingItem and isDraggable
* fix insertion indicator layout shift
* fix 'drag between' story drop operations
* fix 'drop into' story
* fix showing insertion indicator in root-only
* refine focusedKey logic
* lint
Co-authored-by: Daniel Lu <dl1644@gmail.com>
Co-authored-by: Danni <drobinson@livefyre.com>
