Lack of integration tests for SQL catalog implementation

[callum-ryan]

Following on from https://github.com/apache/iceberg-rust/pull/610, https://github.com/apache/iceberg-rust/pull/534, https://github.com/apache/iceberg-rust/pull/524 and https://github.com/apache/iceberg-rust/pull/610#pullrequestreview-2335528590 from @liurenjie1024.

The current test suite only runs against SQLite, for the catalog implementation to be robustly tested this should be extended to both PostgreSQL and MySQL.

I've already made a start on this, so happy to take this on!

[liurenjie1024]

Thanks @callum-ryan !

[github-actions[bot]]

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[liurenjie1024]

We should keep this issue, we still need to add it.