[whatwg/storage] Define obtain a storage key (#92)

My intuition from reading https://github.com/w3c/IndexedDB/pull/334 and seeing https://github.com/whatwg/html/issues/3054 is that we should have an "obtain a storage key" as standalone algorithm as well. It takes an environment and returns a storage key or failure.

Initially it would encompass the first three steps of https://storage.spec.whatwg.org/#obtain-a-storage-shelf, namely:

1. Let key be environment’s origin.
2. If key is an opaque origin, then return failure.
3. If the user has disabled storage, then return failure.
4. Return key.

@whatwg/storage agreed?

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