[slightlyoff/ServiceWorker] Provide cache.putAll() method (#867)

If you want to write a bunch of separately obtained request-responses to a cache (e.g. you make requests before you've decided which cache to put them in), there is `cache.put()`, but not `cache.putAll()`. This makes it hard to make the write atomic. Why not add something like `cache.putAll(requests[], responses[])`?

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https://github.com/slightlyoff/ServiceWorker/issues/867