Tracking: replace icelake with iceberg-rust

[chenzl25]

iceberg-rust is the official rust sdk from the iceberg community, while icelake is the experimental repository used to verify and deliver iceberg features in a fast way. Risingwave currently relies on icelake to support features like iceberg source and sink, while since icelake is no longer developed, we should switch to iceberg-rust as soon as possible to avoid technical debt.

[github-actions]

This issue has been open for 60 days with no activity.

If you think it is still relevant today, and needs to be done in the near future, you can comment to update the status, or just manually remove the no-issue-activity label.

You can also confidently close this issue as not planned to keep our backlog clean.
Don't worry if you think the issue is still valuable to continue in the future.
It's searchable and can be reopened when it's time. 😄