[w3c/permissions] Requesting permissions needs to be able to ask for multiple things (#92)

When requesting permission, multiple things need to be asked for in one UI operation - the most common combination in MediaCapture being camera and microphone. There may be multiple suitable options, and the caller may have a preferred ranking.

Two solutions:

1) Combine multiple concurrent permission calls with promise.All, and state that the UI is responsible for presenting multiple requests as one request to the user. This seems complex and non-obvious.

2) Pass multiple lists of permissions as an argument to the "request permission" algorithm, with the assumption that the request succeeds only if one item is successful from each list.

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https://github.com/w3c/permissions/issues/92