REST: Add support for unregister_table

[ebyhr]

Rationale for this change

• Implement REST Spec: Add unregister table endpoint iceberg#16400

Are these changes tested?

Yes

Are there any user-facing changes?

Add unregister_table method to REST catalog.

[rambleraptor]

This looks awesome! Is there any way we could wait for apache/iceberg#16584 to get merged in? I would love to get an integration test going for this method.

[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 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.