[whatwg/fetch] Handle URL length limits (#841)

Browsers limit the length of URLs they'll fetch, but I haven't investigated exactly how. HTTP acknowledges these limits in https://tools.ietf.org/html/rfc7230#section-3.1.1

> Various ad hoc limitations on request-line length are found in
> practice.  It is RECOMMENDED that all HTTP senders and recipients
> support, at a minimum, request-line lengths of 8000 octets.

but doesn't say how they actually work. Even that acknowledgement is moving into the [HTTP/1.1-specific RFC](https://httpwg.org/http-core/draft-ietf-httpbis-messaging-latest.html#request.line) in the current HTTP update.

This should be specified. I (weakly) think Fetch makes more sense than HTTP, since too-long URLs in requests will be rejected before they're sent to a server.

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