Count aggregation

[angrykoala]

Description

Add count fields in aggregations with support for nodes and edges count:

query {
    moviesConnection {
        aggregate {
            count {
                nodes
            }
        }
    }
}

query {
    movies {
        actorsConnection {
            aggregate {
                count {
                    nodes
                    edges
                }
            }
        }
    }
}

[changeset-bot]

🦋 Changeset detected

Latest commit: 833d911

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@neo4j/graphql	Patch

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