[w3c/ServiceWorker] Promise<FrozenArray<T>> should become Promise<sequence<T>> (Issue #1722)

A few methods, namely `Clients`'s `matchAll()`, `Cache`'s `matchAll()`, and `Cache`'s `keys()` return `Promise<FrozenArray<T>>`.

As discussed in https://github.com/whatwg/webidl/issues/1399, it doesn't really make sense to return frozen arrays as return values. The caller should just get back a `sequence<T>`.

It would be nice to clean this up so that the Web IDL spec can disallow using `FrozenArray<T>` in such scenarios.

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