chore(query): add stats for new final aggregators

[dqhl76]

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Summary

part of #19155 （part 1）

Add shared aggregation statistics for new partial/final aggregators and expose hash index resize count.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Not run (not requested)

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe): Observability

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This change is 

[dqhl76]

INFO [TRANSFORMS]: statistics.rs:56 [TRANSFORM-AGGREGATOR][NewFinalAggregate] Aggregation completed: 195025 → 195025 rows in 0.64s (real: 0.12s), throughput: 306.63 thousand rows/sec, 4.68 MiB/sec, total: 2.98 MiB, hash index resizes: 3