[slightlyoff/ServiceWorker] cache.match should create partial responses if given a range request (#913)

I did some research on range requests, and everything's inconsistent https://docs.google.com/document/d/1SphP-WNxqzZrSv_6ApC9_FpM-m_tLzm57oL3SNGg-40/edit#heading=h.1k8r6xdc6vfo

The only reliable way of streaming video across browsers is for the server to return exactly the range requested. It feels like it's expected, and faster, for `cache.match(request)` to generate a 206 (or 416) if the request has a range header.

It'd be great to do this for opaque responses too, where the generated 206/416 would also be opaque, but I'd like a security person to weigh in there.

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