[WIP]collect aws cloudformation templates and stacks at Amazon refreshing

It should be fine in `save_inventory` even if there are no deletes during the refresh process.

I think the main benefits to keeping these inserts in `save_inventory` instead of having them in the parser are:

1.  We get the benefit of batch inserts for any templates that are added during the refresh instead of isolated inserts that happen as needed.
2.  We don't deviate from the known 2-phase process of creating data during the refresh .. if we ever want to overhaul the refresh process, this single insert statement might get lost in the shuffle if it's on its own here in the parser.