[Improvement] Free Iceberg related listener from Iceberg dependencies

### What would you like to be improved?

Iceberg releated classes like `IcebergCreateNamespaceEvent` can be relocated to another module like `iceberg-listener`. At the same time, we need to remove using field `createNamespaceRequest` and `createNamespaceRequest` to get rid of iceberg API dependencies.

### How should we improve?

_No response_