[w3c/clipboard-apis] Clipboard API mixies representations of an item with distinct items. (#55)

On macOS and iOS, there could be multiple representations of multiple entires for copy & paste and drag & drop.

For example, [UIPasteboard](https://developer.apple.com/documentation/uikit/uipasteboard?language=objc) exposes [items](https://developer.apple.com/documentation/uikit/uipasteboard/1622067-items?language=objc) property on iOS, and each item represents multiple representations (e.g. PNG, JPEG, etc...) of a single entity (the same image).

The current [DataTransferItemList](https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist) representation doesn't sit well with this model because it conflates different representations of a single entry with multiple entities in the clipboard.

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