perf python: Add __str__ and __repr__ functions to evlist

This allows the values in the evlist to be shown in the REPL like:

  Python 3.11.9 (main, Jun 19 2024, 00:38:48) [GCC 13.2.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import sys
  >>> sys.path.insert(0,'/tmp/perf/python')
  >>> import perf
  >>> perf.parse_events('cycles,data_read')
  evlist([cycles,uncore_imc_free_running_0/data_read/,uncore_imc_free_running_1/data_read/])

Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dapeng Mi <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Veronika Molnarova <[email protected]>
Cc: Weilin Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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