Re: [w3c/webcomponents] Named slots and the slot attribute requirement (#726)

I think `slot.assign(element)` would be easier than `.replaceAssignment(nodes)` as you could easily just cherry pick elements you need to change slots without needing to filter `slot.assignedNodes()`. This would effectively be identical to setting `slot` on the element but would be unobservable from outside of the shadow root (for closed mode anyway, I suppose `.assignedSlot` would work as normal for open mode).

For example suppose you had some component that was a slideshow or something, you would probably want to write something like this:

```js
class SlideShow extends HTMLElement {
    ...

    _changeToNextSlide() {
        const hiddenSlides = this._shadowRoot.querySelector("#hiddenSlides")
        const visibleSlide = this._shadowRoot.querySelector("#visibleSlide")
        hiddenSlides.assign(this.children[this.currentSlide])
        this.currentSlide += 1
        visibleSlide.assign(this.children[this.currentSlide])
    }
}
```

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