mutation_partition: use type-aware printing of the clustering row
mutation_partition: use type-aware printing of the clustering row

Now that position_in_partition_view has type-aware printing, use it
to provide a human readable version of clustering keys.
Message-Id: <73fe4b6e963b3525d42c67bac67ac95a885b172e@scylladb.com>

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