storage_proxy: move verbose query result printing into separate logger
storage_proxy: move verbose query result printing into separate logger

If query result is large tracing cannot be done since printing the result takes
too much time and space.

scylladb/scylla,duarten/scylla,scylladb/scylla,raphaelsc/scylla,scylladb/scylla,kjniemi/scylla,avikivity/scylla,avikivity/scylla,kjniemi/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,duarten/scylla,raphaelsc/scylla,raphaelsc/scylla