Tutorial: Pagination

This tutorial covers the implementation of cursor-based pagination in a React + GraphQL application. The server's schema is updated to expose an API for loading smaller chunks of data, and the client-side code is modified to use this new API. A new resolver is added to fetch messages from the server using cursors, which allows the client to load only a page's worth of data at once. The Apollo Client cache is also updated to handle the new message feed structure. Finally, a `fetchMore` function is implemented to load older messages when the "Load Older Messages" button is clicked, demonstrating cursor-based pagination in practice.