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Rossi Sun authored and GitHub committed d1bf85631f9
GH-45344: [C++][Testing] Generic `StepGenerator` (#45345) ### Rationale for this change #45344 ### What changes are included in this PR? Make the `StepGenerator` generic. ### Are these changes tested? UT included. ### Are there any user-facing changes? None. * GitHub Issue: #45344 Lead-authored-by: Rossi Sun <zanmato1984@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr> Signed-off-by: Rossi Sun <zanmato1984@gmail.com>