Re: [w3c/webcomponents] Lazy Custom Element Definitions (#782)

The trigger for `customElements.defineLazy` is not to connected an element into the DOM, but to create an instance of unregistry custom element, 
```JavaScript
// this code should call `customElements.defineLazy`
const myComponent = document.createElement('foo-bar')
```
After resolved `customElements.whenDefined` require auto call `customElements.upgrade` for instance by instance `myComponent`

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