[Task]: Achieve v3 compliance for IcebergIO #40829

What needs to happen?

We still need a few more steps to become Iceberg v3 compatible:

• Add new data types (variant, nano timestampts, geo types)
• Support table encryption keys ([IcebergIO] Ensure compliance with table encryption #39808)
• Support reading metadata columns (including row lineage) in regular reads. This is already supported in CDC reads.

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

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