Implement Sql Catalog.

[liurenjie1024]

Implement sql catalog.

[liurenjie1024]

Blocked by #250

[hendrikmakait]

Is there anything missing or has this been completed by #524?

[kevinjqliu]

@hendrikmakait i dont think so, i see a lot of todos in that PR https://github.com/apache/iceberg-rust/pull/524/files#diff-0095ccc22a02ff26cc0c2f2016a0573cecfeded94dfeb7fdf249b2ec57764194R186

[github-actions]

This issue has been automatically marked as stale because it has been open for 180 days with no activity. It will be closed in next 14 days if no further activity occurs. To permanently prevent this issue from being considered stale, add the label 'not-stale', but commenting on the issue is preferred when possible.