Get generation_site view to work:
+ Modify Emitter to codify rules for emitting TableInstances so that we emit aliases or
  table names appropriately.
+ Arrange for some new emitter options to avoid emitting a db token.
+ Struggle with typing in info schema; this is temporary, once the conversion is complete
  one half of the hierarchy will be removed.
+ Arrange to defang part of view processing when parsing for infoschema.
+ Switch to using a fronting schema for views.
+ Add a builder for info schema views, add a view (generation_site)
+ Refactor out execution slightly to handle view based processing.
  Arrange for the LogicalSchemaQueryEngine to return either the current result sets
  based result, or else a FeatureStep.
+ Fix some corner cases in the dml view transformer.