[EPIC] Update Iceberg integration to use `native_iceberg_compat` scan

[andygrove]

What is the problem the feature request solves?

Comet's Iceberg integration currently uses native_comet scan, which does not support complex types.

We are still working on completing the current integration, and then would like to move to using native_iceberg_compat instead for complex type support.

Describe the potential solution

• Identify design changes needed
• Implement changes in Comet API
  • ColumnReader
    • PageReadStore ?
    • S3FileIo Support
  • BatchReader
• Implement corresponding Iceberg changes

Additional context

No response