Re: [whatwg/streams] Add a flag to determine wether a ReadableStream is disturbed or cancelled (#1025)

@yutakahirano It's not only used for `Response.bodyUsed` it's mainly used to understand if response body is valid at all. This is why Response's constructor fails and not just set `bodyUsed` in `true` when the stream has been already disturbed. Without this restriction such things like ServiceWorker's cache wouldn't work correctly.

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