Re: [whatwg/storage] Bucket hooks (#18)

Relaying some discussion from IRC:

> Let key be the result of obtaining a storage key from environment. (This should be less hand-wavy.)

I assume most of the time the storage key will be an origin. But not always. In particular this step will allow us to define both double-keying and blocking of storage.

Note that currently storage is blocked in opaque origins on a per-API basis (e.g. [localStorage](https://html.spec.whatwg.org/multipage/webstorage.html#storage-object-initialisation-steps), [idb.open()](https://w3c.github.io/IndexedDB/#dom-idbfactory-open)). Those mechanisms should probably be subsumed here, so that if _environment_ is an opaque origin, key is failure, and the rest of the algorithm fails. This also allows other scenarios to block storage by intervening at the "obtain a key" stage.

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