[whatwg/fetch] Request body streams that cannot be retried (#538)

Currently our design is such that request body streams cannot be retried and that any redirects (other than 303) and HTTP authentication end up failing the request. This is rather nice for memory usage, but according to @ekr this plays badly with TLSv13 and QUIC which both assume requests can be retried.

Sigh.

cc @jakearchibald @yutakahirano @tyoshino @domenic @mnot 

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