scripts: Add script to parse IO traces
scripts: Add script to parse IO traces

The script collects the data from io and fq trace messages and
prints some stats:

- per-size timings stats for requests
- queue numbers stats
- delays between dispatches
- num of requests submitted in one dispatch call (batch count)
- total number of requests processed

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

avikivity/seastar,syuu1228/seastar,cloudius-systems/seastar,scylladb/seastar,cloudius-systems/seastar,dreamsxin/seastar,syuu1228/seastar,dreamsxin/seastar,scylladb/seastar,avikivity/seastar,scylladb/seastar,syuu1228/seastar,cloudius-systems/seastar,avikivity/seastar,dreamsxin/seastar