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ARROW-16981: [C++] Expose jemalloc statistics for logging (#13516)

This is to resolve [ARROW-16981](https://issues.apache.org/jira/browse/ARROW-16981).

Lead-authored-by: Rok <rok@mihevc.org>
Co-authored-by: Rok Mihevc <rok@mihevc.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>