[PR] feat(spec): add partition statistics rows and versioned schemas [iceberg-rust]

["kamcheungting-db (via GitHub)" <gi...@apache.org>]

kamcheungting-db opened a new pull request, #3335:
URL: https://github.com/apache/iceberg-rust/pull/3335

   ## Which issue does this PR close?
   
   - Related to #1102.
   - Implements the first milestone proposed in #3305.
   
   ## What changes are included in this PR?
   
   - Add the public `PartitionStatistics` row model with nullable read-facing fields and a separate zero-initialized computation constructor.
   - Build version-aware stored schemas for Iceberg format v1/v2 and v3, including v3 deletion-vector defaults.
   - Preserve nested partition field IDs and reject empty partition types or field-ID collisions.
   - Export the new API and update the generated public API snapshot.
   
   This PR is limited to the row model and schema contract. It does not add statistics file I/O, computation, scanning, or metadata registration.
   
   ## Are these changes tested?
   
   Yes. Focused unit tests cover v1/v2 and v3 schemas, requiredness and defaults, nested field IDs, invalid schemas, partial rows, computation initialization, signed counters, and preservation of imported exact totals.
   
   `cargo test -p iceberg --lib spec::partition_statistics`
   
   Result: 11 passed, 0 failed.
   
   ## AI Disclosure
   
   This PR was developed with assistance from OpenAI Codex and reviewed and directed by the author.


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