mvcc: Make partition_snapshot_row_cursor printable
mvcc: Make partition_snapshot_row_cursor printable

avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla