cql3::untyped_result_set: Add view getter to make non-intrusive read chaper
cql3::untyped_result_set: Add view getter to make non-intrusive read chaper

Also use in actual data conversion.

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