perf mem: Add -s/--sort option

perf mem: Add -s/--sort option

So that users can set the sort key manually as they want.

  $ perf mem report -s
   Error: switch `s' requires a value
   Usage: perf mem report [<options>]

      -s, --sort <key[,key2...]>
                          sort by key(s): overhead overhead_sys overhead_us overhead_guest_sys
  			  overhead_guest_us overhead_children sample period
  			  weight1 weight2 weight3 ins_lat retire_lat p_stage_cyc
  			  pid comm dso symbol parent cpu socket srcline srcfile
  			  local_weight weight transaction trace symbol_size
  			  dso_size cgroup cgroup_id ipc_null time code_page_size
  			  local_ins_lat ins_lat local_p_stage_cyc p_stage_cyc
  			  addr local_retire_lat retire_lat simd type typeoff
  			  symoff symbol_daddr dso_daddr locked tlb mem snoop
  			  dcacheline symbol_iaddr phys_daddr data_page_size
  			  blocked

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.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: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240731235505.710436-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>