This PR adds support for passing additional props to the HTML element of
Next.js `RootLayout`.
#### Context
In our setup, we use several custom Chakra UI components. This change
enables us to add a custom font `className` to the HTML element,
following the official Chakra UI documentation:
[Using custom fonts in Chakra UI with
Next.js](https://v2.chakra-ui.com/getting-started/nextjs-app-guide#using-custom-font)
#### Example Usage
With this update, we can now pass a `className` for custom fonts like
this:
```tsx
import { Rubik } from 'next/font/google'
const rubik = Rubik({
subsets: ['latin'],
variable: '--font-rubik',
})
const Layout = ({ children }: Args) => {
return (
<RootLayout htmlProps={{ className: rubik.variable }}>
{children}
</RootLayout>
);
}
```
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