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 <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ian Rogers <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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