Support real cursor based paging

[Andy2003]

Currently the cursor based paging is converted to offset based paging at graphql-server-side.

A Cursor:

• looks like YXJyYXljb25uZWN0aW9uOjE=
• which decodes to arrayconnection:1
• which results in offset 2 to be used for the query

This is not cursor-based paging because it does not take into account intermediate changes in data between two requests.

At least it should be stated in the documentation that no real cursors are used.

See also:

https://github.com/neo4j/neo4j/issues/12695#issuecomment-1182497250