[whatwg/fetch] Define a cache for H2 server push & friends (#354)

We have several features that interact with some cache that is not really defined:

* rel=prefetch
* rel=preload
* H2 server push

I think the approximate semantics we want are HTTP cache semantics. However, resources that cannot be cached should only survive the lifetime of the fetch group and can only be fetched within the scope of that fetch group (once?).

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