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

Many people are favor of the third one.  Let's proceed with the third one if no one has a strong opinion against it.

We need to define the followings:

## Interface name

```HTMLElementPrimitives``` (drop ```HTML```?), ```ElementSemantics```, etc.
Please reply your ideas.

## Callback

First I thought we could add a ```Something``` argument to ```connectedCallback```, but I found that custom element implementations needed to call a protected API before connecting to a document tree in Form Participation API. So we should introduce new callback.

My current proposal is ```createdCallback```, which is called just after upgrade, maybe before ```attributeChangedCallback```.

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