Re: [w3c/webcomponents] How to define APIs only for custom element authors (#758)

@alice An example of **option 5** for element semantics would be like

```js
// ...
const {withSemantics} = customElements.elementFeatures

class MyEl extends withSemantics( HTMLElement ) {
  // ...
  receiveSemantics( semantics ) {
    const privates = elementPrivates.get(this);
    privates.semantics = semantics;
  }
}

customElements.define('my-el', MyEl)
```

where in this example, the `receiveSemantics` callback will be called by the `withSemantics` mixin implementation. So `receiveSemantics` (or whatever it will be called) should only be defined on classes that have an application of the `withSemantics` mixin.

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