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28ab4afe - GH-41035: [C++] Add a grouper benchmark for preventing performance regression (#41036)

GH-41035: [C++] Add a grouper benchmark for preventing performance regression (#41036) ### Rationale for this change Add a grouper benchmark for preventing performance regression . https://github.com/apache/arrow/pull/40998#issuecomment-2039204161. ### What changes are included in this PR? Added a benchmark. ### Are these changes tested? Needn't. ### Are there any user-facing changes? No * GitHub Issue: #41035 Authored-by: ZhangHuiGui <hugo.zhang@openpie.com> Signed-off-by: Antoine Pitrou <antoine@python.org>