Re: [w3c/ServiceWorker] FetchEventInit.preloadResponse should not be a required member (#1114)

This is in https://w3c.github.io/ServiceWorker/#fetchevent-interface

Making it optional, perhaps the prose of the constructor should just create a new promise that is never settled, like what `Promise<any> preloadResponse = new Promise()` would do if that were valid syntax. Or create a rejected promise. Anything WFM :)

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