streaming: Move ranges in stream_plan
streaming: Move ranges in stream_plan

The ranges are not used afterwards. We can move instead of copy.
Message-Id: <8a0272bb9e07d769425f280a255d48dce7ba8f08@scylladb.com>

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