feat(scan): add pruning trace baselines#381
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Part of #385
What changed
Adds scan planning trace counters to Paimon table scans and exposes them through DataFusion physical plan display.
The trace records manifest list counts, partition/bucket/data-stats pruning counters, cross-schema stats pruning, data-evolution pruning counters, LIMIT split reduction, and final split/file counts.
Why
This gives a self-contained way to verify metadata pruning behavior for partition pruning, bucket-key pruning, LIMIT, COUNT(*) statistics rewrite, SQL BETWEEN partition pruning, and time-travel snapshot selection.
Validation
cargo test -p paimon test_plan_with_trace_records_between_data_stats_pruning --lib -- --nocapturecargo test -p paimon-datafusion --test scan_pruning_trace -- --nocapturegit diff --check