Catalog for sync and export#71

Draft

boutell wants to merge 6 commits intomainfrom

catalog-for-sync-and-export

Commits on Jul 6, 2020

beginnings of a catalog method to make implementing sync and export operations possible
Tom Boutell
committed

Commits on Jul 13, 2020

catalog and catalog tests pretty far down the road for local and azure in addition to s3, but local needs a disabledFileKey catalog test, and azure and s3 need tests exercising the continuation tok…
Tom Boutell
committed

Commits on Jul 14, 2020

* catalog works in gcs
Tom Boutell
committed
I'm wrecked in azure somehow after discovering and trying to fix the horrible mess with getUrl that somehow crept in
Tom Boutell
committed

Commits on Oct 14, 2021