[whatwg/storage] Allow users to collapse shelves (#115)

The work here should include efforts to allow users to share data among shelves.

For one example, as a user, I don't want to carry a series of WebBundles from a trusted provider with me that each end up on their own shelf. I want my shelves of content to work together neatly. I have gotten a series of resources that I now carry with me, but because of this specification, they are each their own fragmented, disunified, separate experience, and I the user have no option, no capability to bring the data that this specification has broken apart on different shelves back together.

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