Missing online/offline views for identifying slices to cancel #300
Description
As mentioned sometime ago on #150 (comment), we currently offer no way for users to identify slices (probably the last slice would suffice) that have been sent to the auction queue originating from a given burrow. This information is needed when one wants to call entrypoint_cancel_liquidation_slice.
Since advanced users can always reconstruct this information by looking into Checker's storage this has low priority at the moment, but it would be nice to offer this information at some point.