[whatwg/storage] Add the ability for bottles to have a quota (#97)

And use this to port HTML's 5 MiB suggestion.

See #95.


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### :boom: Error: 400 Bad Request :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jun 4, 2020, 10:26 AM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs.

:link: [Related URL](https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2Fwhatwg%2Fstorage%2F8a119d2d85fbe27a314f660bf7a5a67e46b1a5cc%2Fstorage.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%2097)



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

  https://github.com/whatwg/storage/pull/97

-- Commit Summary --

  * Add the ability for bottles to have a quota

-- File Changes --

    M storage.bs (25)

-- Patch Links --

https://github.com/whatwg/storage/pull/97.patch
https://github.com/whatwg/storage/pull/97.diff

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