perf trace: Support --summary-mode=cgroup

perf trace: Support --summary-mode=cgroup

Add a new summary mode to collect stats for each cgroup.

  $ sudo ./perf trace -as --bpf-summary --summary-mode=cgroup -- sleep 1

   Summary of events:

   cgroup /user.slice/user-657345.slice/user@657345.service/session.slice/org.gnome.Shell@x11.service, 535 events

     syscall            calls  errors  total       min       avg       max       stddev
                                       (msec)    (msec)    (msec)    (msec)        (%)
     --------------- --------  ------ -------- --------- --------- ---------     ------
     ppoll                 15      0   373.600     0.004    24.907   197.491     55.26%
     poll                  15      0     1.325     0.001     0.088     0.369     38.76%
     close                 66      0     0.567     0.007     0.009     0.026      3.55%
     write                150      0     0.471     0.001     0.003     0.010      3.29%
     recvmsg               94     83     0.290     0.000     0.003     0.037     16.39%
     ioctl                 26      0     0.237     0.001     0.009     0.096     50.13%
     timerfd_create        66      0     0.236     0.003     0.004     0.024      8.92%
     timerfd_settime       70      0     0.160     0.001     0.002     0.012      7.66%
     writev                10      0     0.118     0.001     0.012     0.019     18.17%
     read                   9      0     0.021     0.001     0.002     0.004     14.07%
     getpid                14      0     0.019     0.000     0.001     0.004     20.28%

   cgroup /system.slice/polkit.service, 94 events

     syscall            calls  errors  total       min       avg       max       stddev
                                       (msec)    (msec)    (msec)    (msec)        (%)
     --------------- --------  ------ -------- --------- --------- ---------     ------
     ppoll                 22      0    19.811     0.000     0.900     9.273     63.88%
     write                 30      0     0.040     0.001     0.001     0.003     12.09%
     recvmsg               12      0     0.018     0.001     0.002     0.006     28.15%
     read                  18      0     0.013     0.000     0.001     0.003     21.99%
     poll                  12      0     0.006     0.000     0.001     0.001      4.48%

   cgroup /user.slice/user-657345.slice/user@657345.service/app.slice/app-org.gnome.Terminal.slice/gnome-terminal-server.service, 21 events

     syscall            calls  errors  total       min       avg       max       stddev
                                       (msec)    (msec)    (msec)    (msec)        (%)
     --------------- --------  ------ -------- --------- --------- ---------     ------
     ppoll                  4      0    17.476     0.003     4.369    13.298     69.65%
     recvmsg               15     12     0.068     0.002     0.005     0.014     26.53%
     writev                 1      0     0.033     0.033     0.033     0.033      0.00%
     poll                   1      0     0.005     0.005     0.005     0.005      0.00%

   ...

It works only for --bpf-summary for now.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20250501225337.928470-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>