[w3c/ServiceWorker] Provide a simple synchronous k-v storage for ServiceWorker? (#981)

It seems to me the only storage currently exists in ServiceWorker is Cache, which is designed for storing request-response pair.

However, sometimes the worker may just want to store some simple data in a key-value storage which can be read/write synchronously (like `localStorage` in page), rather than an asynchronous request cache.

Some possible usecases like:

1. store a revision number and use it to check whether the cache is stale;
2. cache submitted data when offline;
3. do adjustment on data from server and cache the result.

A key-value storage can be simulated with Cache, but it would be great if it is provided natively.

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