perf(sysbench): add Sysbench_Performance runner

Run CPU/Memory/Threads/Mutex workloads with iterations support.
Capture per-iteration logs while streaming output to console.
Compute KPI averages and optionally gate against baseline+delta.

Signed-off-by: Srikanth Muppandam <smuppand@qti.qualcomm.com>

Author: smuppand