Re: [w3c/ServiceWorker] Include imported scripts to byte-check (#1023)

When the imported scripts are checked, we're doing it with `no-cache`, but then later when we run the script it'll execute `importScripts` and once again request the resources `no-cache`.

I hadn't thought about this until reading this PR, but I think it's something we need to solve.

"Check If Service Worker Resources Are Identical" could return a boolean as it does now, but also a map of all the scripts it fetched. Then, `importScripts` could check this cache before going to the network. This cache can be deleted once install completes - or whenever we set the "imported scripts updated flag" flag, which discards imports that were used in the previous version, but not this one.

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