Writing v3 table metadata

[rambleraptor]

Part of #1818

This might be early. This enables writing v3 metadata

Rationale for this change

We'll need this at some point for v3 support.

Are these changes tested?

Unit test included.

Are there any user-facing changes?

• Adds support for writing v3 table metadata.

[glesperance]

Hey @rambleraptor, similar to my comment on your deletion_vector_write PR, I've added Spark interop tests for the V3 metadata work: glesperance/iceberg-python@f57ea40c

• test_spark_reads_pyiceberg_v3_metadata (pyiceberg → Spark): Verifies Spark can read V3 table metadata written by pyiceberg
• test_pyiceberg_reads_spark_v3_table (Spark → pyiceberg): Verifies pyiceberg can read V3 tables created by Spark

Happy to open a PR against your branch, or feel free to cherry-pick if easier.

[github-actions]

This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that's incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@iceberg.apache.org list. Thank you for your contributions.

[github-actions]

This pull request has been closed due to lack of activity. This is not a judgement on the merit of the PR in any way. It is just a way of keeping the PR queue manageable. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.