Support Fediverse OpenGraph tag

[Vinnl]

Goals

Mastodon (and presumably, soon, other apps) will start to parse the following metadata:

<meta name="fediverse:creator" content="@[email protected]" />

It would be great if we could also expose these using generateMetadata and the static metadata object.

Non-Goals

No response

Background

It's a new sort-of specification that's a good way of highlighting one's social media profile when links to a Next.js page are shared.

Proposal

Similar to the openGraph key, it would probably make sense to be able to add something like this to the metadata object:

export const metadata = {
  fediverse: {
    creator: '@[email protected]',
  },
}