perf list: Add metrics to command line usage

Before:

 Usage: perf list [<options>] [hw|sw|cache|tracepoint|pmu|sdt|event_glob]

After:

 Usage: perf list [<options>] [hw|sw|cache|tracepoint|pmu|sdt|metric|metricgroup|event_glob]

Committer testing:

Before and after we get these outputs on a Lenovo t480s (i7-8650U):

  # perf list metricgroup

  List of pre-defined events (to be used in -e):

  Metric Groups:

  BrMispredicts
  BrMispredicts_SMT
  Branches
  Cache_Misses
  DSB
  FLOPS
  FLOPS_SMT
  Fetch_BW
  IcMiss
  Instruction_Type
  Memory_BW
  Memory_Bound
  Memory_Lat
  No_group
  PGO
  Pipeline
  Power
  Retire
  SMT
  Summary
  TLB
  TLB_SMT
  TopDownL1
  TopDownL1_SMT
  TopdownL1
  TopdownL1_SMT
  #

  # perf list metric | head -11

  Metrics:

    Backend_Bound
         [This category represents fraction of slots where no uops are being delivered due to a lack of required resources for accepting new uops in the Backend]
    Backend_Bound_SMT
         [This category represents fraction of slots where no uops are being delivered due to a lack of required resources for accepting new uops in the Backend. SMT version; use when SMT is enabled and measuring per logical CPU]
    Bad_Speculation
         [This category represents fraction of slots wasted due to incorrect speculations]
    Bad_Speculation_SMT
         [This category represents fraction of slots wasted due to incorrect speculations. SMT version; use when SMT is enabled and measuring per logical CPU]
  #

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200522064546.164259-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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