tests: benchmarks: sched_queues: Record metrics

Enhance the sched_queue benchmark to output resulting summary
metrics as records, so when it runs with Twister the results
are parsed and saved into twister.json and recording.csv files
for further analysis.
Minor documentation edits and make ClangFormat happy.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>