[whatwg/dom] Define dataset as a mixin for HTMLElement and SVGElement (#280)

The `SVGElement` and `HTMLElement` interfaces both define a `dataset` IDL attribute.

The SVGWG are wondering about the possibility of moving the definition into DOM as a mixin interface that can then be applied to both `HTMLElement` and `SVGElement`.

Issue in SVGWG tracker: https://github.com/w3c/svgwg/issues/f

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