[VL][Delta] Emit parquet field ids for UniForm tables on the native write path

[malinjawi]

What changes were proposed in this pull request?

A Delta table with IcebergCompatV2 is supposed to produce parquet files whose footers carry Iceberg-compatible field ids. Vanilla Delta arranges that in prepareWrite by installing DeltaParquetWriteSupport, but that only configures parquet-mr — when the write is offloaded, Velox writes the file directly and never consults it. The ids can't leak in through Arrow either, since SparkArrowUtil.toArrowField drops StructField metadata.

So a UniForm table written natively ends up with no field ids at all, with no error and no fallback, while the IcebergConverter happily publishes Iceberg metadata over those files.

This reads the ids Delta already recorded in the schema — parquet.field.id for columns, parquet.field.nested.ids for the synthetic list-element / map-key / map-value nodes — and passes them through the write options into ParquetWriterOptions. Gated on IcebergCompatV2, so nothing changes for other tables. Mirrored into src-delta40, where the helper is identical and symlinked.

Native Delta write is still experimental and off by default, so this closes a correctness hole ahead of that flag rather than fixing shipped behaviour.

How was this patch tested?

GlutenDeltaParquetFieldIdSuite covers the encoding. DeltaUniFormIcebergSuite writes a partitioned table with nested struct/array/map columns, checks the footer with Delta's own isParquetIcebergCompatV2, and reads the table back through Iceberg.

Notes

Draft, and there's a known gap I'd rather flag than hide: the end-to-end suite drives the write with INSERT INTO, which OffloadDeltaCommand doesn't offload, so it currently exercises the vanilla path and would pass with this change reverted. I'm reworking it onto an offloaded write with an explicit offload assertion before this is ready for review.

Two open questions I'd welcome opinions on:

• The gate could reasonably be "the schema carries parquet.field.id" rather than IcebergCompatV2. Delta enables field-id write for every session and writes the key for both name and id mapping, so the native writer is dropping ids for ordinary column-mapped tables too — the wider gate would cover IcebergCompatV1 and id mapping in the same guard.
• Missing metadata currently yields -1. Delta's own getNestedFieldId throws instead, and Velox omits the annotation entirely for negative ids, so failing fast is probably the better behaviour.

This is the write-side counterpart to #12884, which plumbs column mapping mode through scan splits.

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