Re: [WICG/webcomponents] [idea] Make use of `observedAttributes` optional (#565)

This is something I have been looking for for quite some time already. When developing Web Components, there are plenty of use cases where you want to update the list of observed attributes in your Component.

By providing a simple API, something along the lines of 

```javascript
customElements.updateObervableAttributes('my-component')
```

or built into the HTMLElement class,

```javascript
// inside HTMLElement
this.updateObservableAttributes();
```

The developer could manage the updating of the attributes themselves.

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