[whatwg/storage] Add UsageDetails dictionary (#69)

This change adds a new dictionary to the result of `StorageManager.estimate()` that breaks down usage by storage system.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/storage/pull/69

-- Commit Summary --

  * Add UsageDetails dictionary.

-- File Changes --

    M storage.bs (18)

-- Patch Links --

https://github.com/whatwg/storage/pull/69.patch
https://github.com/whatwg/storage/pull/69.diff

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