[storage/qmdb] fuzz test floor raising #2627
Description
I have introduced bugs in floor raising more than once which were not caught by any of our testing infra. I believe the best way to prevent these from sneaking in again (and to confirm others don't exist) would be to have the qmdb/any and qmdb/current fuzz tests verify floor raising is being performed as expected. (These kinds of bugs are consensus critical, since the floor after each commit is reflected in the state root.)
(More tests around verifying state root stability should also be effective in detecting these.)