[w3c/webcomponents] Is there a way to detect is a custom element was constructed during parsing? (#789)

F.e.,

```js
class MyEl extends HTMLElement {
 constructor() {
  if (/* isParsing? */) {
    console.log('created during parsing')
  }
 }
 connectedCallback() {
  if (/* isParsing? */) {
    console.log('connected during parsing')
  }
 }
}
```

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