[w3c/ServiceWorker] consider allow late importScripts/import for local URLs (#1595)

Could we allow late `import()` and `importScripts()` after installation if the script URL is considered "local"?

https://fetch.spec.whatwg.org/#local-scheme

So for example, you could do a late `import()` or `importScripts()` to a `data:` or `blob:` URL.

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