[Bug report] Created by /updated by user and timestamp not populated when creating/updating table outside Gravitino Web UI

### Version

main branch

### Describe what's wrong

When using non-ui client, such as Spark-sql, to create/update iceberg table through Iceberg REST API, there's no values populated in the "Created by" or "Created at" etc.. fields on the table.

### Error message and/or stacktrace

There's no error message

### How to reproduce

Create a table through client other than Gravitino Web UI, using Iceberg Rest API

### Additional context

Using Iceberg Rest APIs