Optimize KDS V2 resource syncer

[jakubdyszkiewicz]

Description

Instead of calling

if err := s.resourceStore.List(ctx, downstream); err != nil {

we should do

keys := resourcekeys(ResourceAdded) + ResourceRemoved
if err := s.resourceStore.List(ctx, downstream, ListByKeys(keys); err != nil {

This filter does not exist. We need to implement this in paginated resource store so it's by default available for all store and additionally in postgres we need to support native query.

On the InitialRequest we don't want to set this filter.