[Bug] Scheduler runtime metrics not shown #242

Scheduler runtime metrics are not detected by the collector. The affected tracepoint is sched:sched_stat_runtime and it should track the execution execution of a task in nanoseconds.

See otel_metrics.rs per user space metrics implementation and metrics_tracer/src/cpu.rs for the sched_stat_runtime extraction from the tracepoint sched:sched_stat_runtime

Images affected: Ubuntu metrics image/ alpine metrics image