fix: deserialization error of AdditionalStatsMeta.location

[zhyass]

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Summary

This PR changes the location field in AdditionalStatsMeta from Option<Location> to Location.
To ensure backward compatibility with existing serialized metadata where location may be missing or null, we introduce a default_location function with #[serde(default)].
This guarantees that deserialization of old data will succeed, while new data will always include a valid location field.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

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):

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This change is 

[github-actions]

Docker Image for PR

• tag: pr-18618-a56f19d-1756291290

note: this image tag is only available for internal use.

[github-actions]

ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/18618/17263659476/hits.html
• internal: https://benchmark.databend.com/clickbench/pr/18618/17263659476/internal.html
• load: https://benchmark.databend.com/clickbench/pr/18618/17263659476/load.html
• tpch: https://benchmark.databend.com/clickbench/pr/18618/17263659476/tpch.html

[github-actions]

Docker Image for PR

• tag: pr-18618-d755c66-1756313967

note: this image tag is only available for internal use.