[whatwg/fetch] Response constructor should handle SharedArrayBuffer (#1004)

Currently you can construct a `Response` from an `ArrayBuffer` and it will correctly copy the contents.

However, if you try to construct a `Response` from a `SharedArrayBuffer`, it seems to stringify the object, resulting in `[object SharedArrayBuffer]`, and then uses that string as a source data. https://twitter.com/RReverser/status/1233446149291417605

This behaviour can be quite surprising and it seems that the constructor should either clone data from `SharedArrayBuffer` upon creation or explicitly reject it with a `TypeError`.

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