feat(templates): expose components to template POC

[Haroenv]

Summary

Following developit/htm#167, it's possible to expose the components so they look like regular elements, having the advantage that they will show up in devtools, and be able to use hooks.

Result

In templates, you can use the component by its name, instead of the previously already possible "interpolation for the variable"

// before, as a component (still possible) (not documented):
function template(hit, { html, components }) {
  return html`<${components.Snippet} hit=${hit} attribute="description" />`;
}

// before, not as a component (still possible) (documented):
function template(hit, { html, components }) {
  return html`${components.Snippet({ hit, attribute: 'description' })}`;
}

// now, as a component:
function template(hit, { html }) {
  return html`<Snippet hit=${hit} attribute="description" />`;
}

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