[whatwg/storage] Add 'obtain a storage key for non-storage purposes' (PR #132)

Fixes #131 

This commit adds a new algorithm for obtaining a storage key that is suitable for use in non-storage APIs (for instance, BroadcastChannel). Specifically, this algorithm works regardless of whether storage access has been granted and also allows a storage key to be obtained for opaque origins.

I don't think tests or implementation bugs are needed for this change since this PR maintains the existing functionality of "obtain a storage key" and doesn't use "obtain a storage key for non-storage purposes".  If this is not the case let me know and I'm happy to write tests / open implementation bugs.

- [x] At least two implementers are interested (and none opposed):
   * Chrome
   * Firefox
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * Not required
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: Not required
   * Firefox: Not required
   * Safari: Not required


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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/storage/pull/132

-- Commit Summary --

  * Add 'obtain a storage key for non-storage purposes'

-- File Changes --

    M storage.bs (13)

-- Patch Links --

https://github.com/whatwg/storage/pull/132.patch
https://github.com/whatwg/storage/pull/132.diff

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