Implement a "connection-helper" as specified in the GraphQL-Spec

[asishallab]

In Zendro cursor based pagination returns a connection object adhering to the standard defined for GraphQL. See these sources:

• complete connection model, and
• Relay Specification of Connections

In the first specification you find the example of a helper that implements a short-cut avoiding the explicit querying of edges->nodes and offers direct access to the records contained in a connection.

Implement this helper in Zendro using a reference to the very record-array used in the connection object. The reference ensures that computational resources, in this case memory, will not be exhausted.