[I] Support multi-argument transforms [iceberg-python]

["moomindani (via GitHub)" <gi...@apache.org>]

moomindani opened a new issue, #3628:
URL: https://github.com/apache/iceberg-python/issues/3628

   ### Feature Request / Improvement
   
   Part of #1818.
   
   The V3 spec generalizes partition and sort fields to multiple source columns via `source-ids`. PyIceberg currently raises when `source-ids` has more than one element, so loading such tables fails — but the spec requires v3 readers to read tables with unknown transforms, ignoring them (null partition values, always-true projection in scan planning).
   
   Scope: model `source-ids`, serialize per spec (`source-id` for single-argument transforms, `source-ids` otherwise), and treat multi-argument transforms as unknown in scan planning. Evaluating multi-argument transforms on write is out of scope until the spec defines concrete ones.
   


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