[w3c/manifest] Space-separated sizes in ImageResource? (#807)

@rayankans and I are working on breaking out `ImageResource` currently and, while reading through the `sizes` member in more detail as part of that, I noticed it supports a set of space-separated values (much like its HTML equivalent). As each `ImageResource` has only a single file (`src`) associated with it and that file has one set of natural dimensions, I’m confused as to why we would support multiple values here. But perhaps I’m missing something.

@marcoscaceres @mgiuca @kenchris Any insight here?

Also: *If* it should only be a single value, should we also consider amending it to "size" and deprecate `sizes`, perhaps grandfathering it in by extracting the first set item from any existing `sizes` member as `size`)?

Duplicates https://github.com/rayankans/image-resource/issues/1


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