Support WITH clause GRAPH_TABLE

[Dtenwolde]

Fixes #129

This PR adds the ability to use the FROM GRAPH_TABLE inside a WITH clause.

Couple of examples:

WITH foo AS (
    SELECT id 
    FROM GRAPH_TABLE(snb MATCH (a:Person))
)
SELECT * 
FROM foo 
LIMIT 10;

WITH foo AS (
    FROM GRAPH_TABLE(snb MATCH (a:Person)-[r:Knows]->(b:Person) 
    COLUMNS (a.id AS id, b.id AS knows_id)
)
SELECT * 
FROM foo 
LIMIT 10;