feat: prev/next on edge

I've seem other GraphQL APIs on CMSs provide prev and next connections on a node edge. This would be helpful in my case for creating page level navigation for next post and previous post. I've solved this in JS for now but it would be nice for these to be available in query. It would look something like:

query {
  posts {
    edges {
      next {
        #WpGraphql_Post
      }
      prev {
        #WpGraphql_Post
      }
      node {
        #WpGraphql_Post
       }
    }
  }
}