[slightlyoff/ServiceWorker] Add cache.name property (#869)

While working with SW I found it would be convenient for diagnostics if you could get the name of a cache from the cache itself. Currently you have to keep track of the name passed to `caches.open()` yourself. A `cache.name` read-only attribute would make this easier.

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https://github.com/slightlyoff/ServiceWorker/issues/869