Generate vectorized selection filters for IN.

[lmwnshn]

Feature Request

Summary

Right now, foo IN (1,2,3) is translated to foo = 1 OR foo = 2 OR foo = 3.

Per Prashanth's suggestion in #1326, we can go HAM with IN (I am suddenly fond of this phrasing) and translate IN to use vectorized selection builtins for each value in the IN list.

I think this would mainly involve a tweak to where filters are currently being generated in SeqScanTranslator::GenerateFilterClauseFunctions (and perhaps CTE scan, whenever that eventually merges). We already generate the vectorized select for the = case.