Add SQL support for NATURAL JOIN

[alamb]

Note: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-10727

(We cannot do this until we have basic SQL JOIN working)

A NATURAL JOIN is a JOIN operation that creates an implicit join clause for you based on the common columns in the two tables being joined. Common columns are columns that have the same name in both tables. A NATURAL JOIN can be an INNER join, a LEFT OUTER join, or a RIGHT OUTER join. The default is INNER join.