Re: [whatwg/fetch] Request's total bytes isn't set (#604)

My plan does not work for `Blob` and `FormData`: https://github.com/whatwg/html/issues/6424. The other types should probably still be eagerly converted to a byte sequence...

So maybe we should have convert and that returns a tuple of

* a byte sequence or a  read operation of sorts
* a length

but it's still rather inelegant to do extract and length (which would both use convert) determination separately. So maybe body should store a length after all. (Though we should also be clear that it's different between requests and responses as for responses it can lie, especially with service workers and maybe also with H/2 and H3/, which don't really have that concept although if you specify `Content-Length` maybe it's still required to match?)

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