Provide utilities to implement GraphQL Cursor Connections Specification

[aszenz]

The GraphQL Cursor connections spec is supported by lot of clients to implement pagination, it is useful for the server to provide an api which adheres to this specification since it implements all of the best practices around pagination.

This library can help the developer by making it easy to implement this spec, this may involve providing some abstract classes or services

See the spec here: https://relay.dev/graphql/connections.htm