Add support for NOT IN SUBQUERY

[EpsilonPrime]

The subquery type InPredicate supports IN but it does not support NOT IN which is used in some anti-join implementations.

[westonpace]

Minor nit: I think it's more accurate to say "NOT IN is sometimes implemented by an anti-join". It isn't actually used in an anti-join. NOT IN is a logical query concept that a user typically requests, not an optimization.

[westonpace]

Also, I think NOT EXISTS is missing