[slightlyoff/ServiceWorker] Entries movement between caches (#871)

I have a such situation:

One primary cache, let's call it `static`. This cache always exists, never changes name and only entries in it are changed. Difference is found by comparing two maps 1) existing, described currently cached entries; 2) new, which came with a newly generate SW (new build). Difference is computed on `install` event and new assets/files are stored in `tmp` cache. Then, on `activate` event, old assets are deleted from `static` cache or simply overridden by new version (if file name/url wan't changed).

My question, can we have some fastest way to import entries from one cache to another? Because as far as I understand, reading from one cache and writing to another is kind of slow and not "looking good" operation.

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