[w3c/webcomponents] [declarative-custom-elements] shorter syntax (#885)

If we're going to add special attributes to `template`, like `shadowmode` which is specifically for custom elements (right?) then why not use template for the custom element definition without and extra `definition` element (less nesting)?

F.e. instead of

```html
<definition name="percentage-bar">
    <template shadowmode="closed">
        <div>...</div>
        <style>/*...*/</style>
    </template>
    <script type=module>
        export default class MyEl extends HTMLElement { /*...*/ }
    </script>
</definition>
```

We could write the following more simple version:

```html
<template element="percentage-bar" shadowmode="closed">
    <div>...</div>
    <style>/*...*/</style>
    <script type=module>
        export default class MyEl extends HTMLElement { /*...*/ }
    </script>
</template>
```

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