catalog generation for redshift

[cmcarthur]

@drewbanin do we have incomplete code for this somewhere?

[drewbanin]

The version I have for redshift is identical to the existing postgres implementation. We'll need to update it for Redshift to account for:

• views
• late binding views?
• sort/dist keys, column encoding, table size, etc

If I remember correctly, Redshift makes joining to some of these system table really painful. Let's see how much we can do for the v1

[beckjake]

Closed in #866