[VL] feat(iceberg): Add V3 initial value reads#12537
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Background
Iceberg V3 supports initial default values for newly added columns, but the velox backend did not previously propagate the required metadata to return those defaults.
Changes
This PR carries Iceberg field IDs and initial-default metadata to Velox.
Impact
Velox can now correctly return configured initial default values instead of
NULLwhen reading older rows from Iceberg V3 tables.Feature
https://iceberg.apache.org/spec/#default-values