GraphQL: Create a generic query node type for pagination

GitHub's current GraphQL API supports a generic `query.resource` type:

```js
query {
resource(url:"https://github.com/gr2m/sandbox") {
... on Repository {
nameWithOwner
}
}
}
```

It would be great to have a generic node type that would allow for pagination.

```js
query($cursor: String) {
paginate(first: 100, after: $cursor) {
pageInfo {
endCursor
hasNextPage
}
nodes {
... on Repository {
nameWithOwner
}
}
}
}
```

That would greatly simplify to paginate complex queries with multiple, nested paginations

The issue includes GraphQL examples for a generic paginated node but names no repository files, tests, or entry points. Start by determining how this wishlist records API proposals and whether implementation work exists here; done would require a defined generic pagination design and an accepted path forward.

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