Add flag on command to introspect schema with Apollo Federation compatible layer

[noghartt]

Today, if you run the command like: hive introspect [url], it loads the schema like this:

schema {
  query: Query
  mutation: Mutation
}

# ...

Comparing with rover CLI, that's how they bring the same introspected schema:

extend schema
  @link(url: "https://specs.apollo.dev/link/v1.0")
  @link(url: "https://specs.apollo.dev/federation/v2.0", import: ["@key", "@shareable", "@external", "@override", "@requires"])
{
  query: Query
  mutation: Mutation
}

# ...

---

I do believe that could be possible to add a flag on introspect commmand to let it be introspected with this Apollo Federation layer of compatibility.

[n1ru4l]

There is already a PR for this, that was never finished 😓