useDrag: add support for isDisabled

[reidbarber]

For parity with useDrop and useClipboard

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Check new story and tests

🧢 Your Project:

RSP

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[LFDanLu]

was thinking about what should happen if the drag target becomes disabled in the middle of a drag operation (e.g. keyboard dnd). I think the current behavior is fine (aka you can still complete the drop part of your current drag operation) but open question for the team in case there were any other opinions.

[reidbarber]

I think we would have to stop the drag session, and that would be a bit weird. Open to implementing that though, if thats what we want to do.

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## API Changes

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@react-aria/dnd

DragOptions

 DragOptions {
   getAllowedDropOperations?: () => Array<DropOperation>
   getItems: () => Array<DragItem>
   hasDragButton?: boolean
+  isDisabled?: boolean
   onDragEnd?: (DragEndEvent) => void
   onDragMove?: (DragMoveEvent) => void
   onDragStart?: (DragStartEvent) => void
   preview?: RefObject<DragPreviewRenderer>
 

it changed:

• useDrag

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