Support writing V3 metadata

[moomindani]

Feature Request / Improvement

Part of #1551.

Enable serializing TableMetadataV3 (currently raises NotImplementedError), creating tables with format-version=3, and upgrading v2 tables to v3. Spec: https://iceberg.apache.org/spec/#version-3

[ebyhr]

@rambleraptor is handling this task in #3551

[moomindani]

Thanks for the pointer — aligning this issue's scope to what #3551 covers. The v2-to-v3 upgrade path is carved out into #3622.