Re: [w3c/webcomponents] Why do we need a registry? (#861)

@rniwa your right i want to upgrade a existing element with all expected behavior of a 
```js
customElement.defined('elemen-name', class extends HTMLElement /* also support build in but that is probally covered as its already constructed*/)
```

- should allow observe attributes and reflect
- should add livecycle callbacks and call connectedCallback on init
- when it gets moved to new document it should call adoptedCallback

out of myView thats it but full inernals may have more behavior to much to list here

I Think i realy could use Object.assign(document.createElement(''), classOrObject)

I think the only complicated part is the attribute observation but maybe there is more

If all that is not possible i think i could even use a customElementV1 polyfill implamentation to have my OwnCustom Element Implamentation but thats maybe not worth it.




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