perf python: Port rwtop from Perl to perf module

Replace the legacy Perl script rwtop.pl with a standalone Python script
in tools/perf/python/rwtop.py using the perf Python module.

Improvements compared to the legacy Perl script:
- Remove the dependency on libperl and Perf::Trace::Util.
- Support both offline perf.data files (via perf.session) and live
  recording (via LiveSession with --live), driving periodic interval
  summaries from event timestamps rather than wall-clock SIGALRM timers
  so both live and offline runs produce deterministic output.
- Convert unsigned 32-bit and 64-bit error return values
  (0xfffff000..0xffffffff and >= 0x8000000000000000) to negative errnos
  so failed read/write syscalls are recorded in the error table rather
  than inflating bytes_read / bytes_written.
- Sanitize non-printable characters in /proc/<pid>/comm to prevent
  terminal control sequence injection.

Add a shell test
(test_rwtop_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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