[iceberg] support altering table properties

[nastra]

Purpose

This adds support for altering Iceberg table properties

Brief change log

Tests

added a unit test that sets/removes table properties

API and Format

Documentation

[Copilot]

Pull request overview

This PR adds support for altering Iceberg table properties in Fluss. The implementation enables setting and removing table properties with proper conversion between Fluss and Iceberg property key formats.

• Implements the alterTable method in IcebergLakeCatalog to handle SetOption and ResetOption table changes
• Adds property key conversion logic to translate between Fluss prefixes (iceberg. and table.) and Iceberg prefixes
• Comprehensive test coverage for setting, updating, and removing table properties

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
fluss-lake/fluss-lake-iceberg/src/main/java/org/apache/fluss/lake/iceberg/IcebergLakeCatalog.java	Implements alterTable method with property update logic and adds convertFlussPropertyKeyToIceberg helper method
fluss-lake/fluss-lake-iceberg/src/test/java/org/apache/fluss/lake/iceberg/IcebergLakeCatalogTest.java	Adds comprehensive test for setting, updating, and removing table properties

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.