Support more filters on "/user/stacks"

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Issue details

Customer wanted to clear out out old empty stacks. This is doable by querying "/user/stacks" (or using pulumi stack ls --all) and then doing client side filtering on resourceCount and lastUpdate.

Query if it makes sense to add a way to filter on those properties to the service. We could at the very least send back less data and this is possibly indexed and so would be much faster on the DB as well?