A relay compatible GraphQL API that uses windowed pagination

This is roughly based on https://artsy.github.io/blog/2020/01/21/graphql-relay-windowed-pagination/

This example uses the following packages:

- @pothos/core: For building the schema
- @pothos/plugin-relay: For adding relay compatible connections and nodes
- graphql-yoga: For creating a server that executes the schema

Schema

``graphql
type Comment {
author: User
comment: String!
id: ID!
post: Post!
}

interface Node {
id: ID!
}

type PageCursor {
cursor: String!
isCurrent: Boolean!
pageNumber: Int!
}

type PageCursors {
around: [PageCursor!]!
first: PageCursor!
last: PageCursor!
}

type PageInfo {
endCursor: String
hasNextPage: Boolean!
hasPreviousPage: Boolean!
startCursor: String
}

type Post implements Node {
author: User
comments(after: ID, before: ID, first: Int, last: Int): PostCommentsConnection!
content: String!
id: ID!
title: String!
}

type PostCommentsConnection {
edges: [PostCommentsConnectionEdge]!
pageCursors: PageCursors!
pageInfo: PageInfo!
}

type PostCommentsConnectionEdge {
cursor: String!
node: Comment!
}

type Query {
node(id: ID!): Node
nodes(ids: [ID!]!): [Node]!
post(id: ID!): Post
posts(after: ID, before: ID, first: Int, last: Int): QueryPostsConnection!
user(id: ID!): User
}

type QueryPostsConnection {
edges: [QueryPostsConnectionEdge]!
pageCursors: PageCursors!
pageInfo: PageInfo!
}

type QueryPostsConnectionEdge {
cursor: String!
node: Post!
}

type User implements Node {
comments(after: ID, before: ID, first: Int, last: Int): UserCommentsConnection!
firstName: String!
fullName: String!
id: ID!
lastName: String!
posts(after: ID, before: ID, first: Int, last: Int): UserPostsConnection!
}

type UserCommentsConnection {
edges: [UserCommentsConnectionEdge]!
pageCursors: PageCursors!
pageInfo: PageInfo!
}

type UserCommentsConnectionEdge {
cursor: String!
node: Comment!
}

type UserPostsConnection {
edges: [UserPostsConnectionEdge]!
pageCursors: PageCursors!
pageInfo: PageInfo!
}

type UserPostsConnectionEdge {
cursor: String!
node: Post!
}
``