perf python: Add support for 'struct perf_counts_values' to return counter data

Add support for the perf_counts_values struct to enable the python
bindings to read and return the counter data.

Committer notes:

Use T_ULONG instead of Py_T_ULONG, as all the other PyMemberDef arrays,
fixing the build with older python3 versions.

Use { .name = NULL, } to finish the new PyMemberDef
pyrf_counts_values_members array, again as the other arrays to please
some clang versions, ditto for PyGetSetDef.

Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250519195148.1708988-5-irogers@google.com


Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>