Add plan parent-reduction rule API - #9196
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Signed-off-by: Joe Isaacs <joe.isaacs@live.co.uk>
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Hooray! CodSpeed harness just leveled up!The base and head of this comparison were measured with different runner settings, so their benchmark values are not directly comparable. What changed between base and head:
Re-run the base with the same settings to get a valid performance comparison. Comparing 
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Summary
PlanParentReduceRuleAPI for child-driven physical-plan rewritesPlanParentRuleSetwhose first successful rewrite winsvortex_layout::plan::optimizerStack
This draft is stacked on #9142 and targets
vortex-plan.The concrete expression optimization rules are intentionally excluded and live in #9166, which is stacked on this PR.
Scope
This PR only introduces the rule framework and APIs. It registers no concrete rules and does not change optimization behavior.
Checks
cargo test -p vortex-layout— 211 passedcargo clippy -p vortex-layout --all-targets --all-features -- -D warningscargo +nightly fmt --all -- --checkgit diff --check