[SPARK-51008][SQL][WIP] Add ResultStage for AQE #49715
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What changes were proposed in this pull request?
Added ResultQueryStageExec for AQE
Why are the changes needed?
Currently AQE framework is not fully self-contained since not all plan segments can be put into a query stage: the final "stage" basically executed as a nonAQE plan. This PR added a result query stage for AQE to unify the framework. With this change, we can build more query stage level features, one use case like #44013 (comment)
Does this PR introduce any user-facing change?
How was this patch tested?
new unit tests.
Also exisiting tests which are impacted by this change are updated to keep their original test semantics.
Was this patch authored or co-authored using generative AI tooling?
NO