perf python: Port sctop to perf module

Port sctop.py from tools/perf/scripts/python/ to a standalone script in
tools/perf/python/ using an SCTopAnalyzer class structure.

Improvements compared to the legacy script:
- Support both offline perf.data analysis (via perf.session, advancing
  display intervals deterministically using event timestamps) and live
  monitoring (via LiveSession with automatic tracepoint fallback from
  raw_syscalls:sys_enter to syscalls:sys_enter_*).
- Resolve architecture-aware syscall names via
  perf.syscall_name(id, session.e_machine) without requiring
  python-audit.
- Replace unsafe signal.SIGALRM dictionary mutation and os.popen("clear")
  subshell spawning with a synchronized threading.Lock / threading.Event
  timer and direct ANSI terminal escape sequences ('\x1b[2J\x1b[H').

Add a shell test (test_sctop_python.sh) to verify the standalone script.

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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