tests: add test for statistics rewrite
tests: add test for statistics rewrite

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

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