perf lock: Add 'contention' subcommand

The 'perf lock contention' processes the lock contention events and
displays the result like perf lock report.  Right now, there's not
much difference between the two but the lock contention specific
features will come soon.

  $ perf lock contention
   contended   total wait     max wait     avg wait         type   caller

         238      1.41 ms     29.20 us      5.94 us     spinlock   update_blocked_averages+0x4c
           1    902.08 us    902.08 us    902.08 us      rwsem:R   do_user_addr_fault+0x1dd
          81    330.30 us     17.24 us      4.08 us     spinlock   _nohz_idle_balance+0x172
           2     89.54 us     61.26 us     44.77 us     spinlock   do_anonymous_page+0x16d
          24     78.36 us     12.27 us      3.27 us        mutex   pipe_read+0x56
           2     71.58 us     59.56 us     35.79 us     spinlock   __handle_mm_fault+0x6aa
           6     25.68 us      6.89 us      4.28 us     spinlock   do_idle+0x28d
           1     18.46 us     18.46 us     18.46 us      rtmutex   exec_fw_cmd+0x21b
           3     15.25 us      6.26 us      5.08 us     spinlock   tick_do_update_jiffies64+0x2c

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220725183124.368304-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>