REST catalog: support AWS sigV4

### Is your feature request related to a problem or challenge?

For AWS glue/s3 tables

rest.sigv4-enabled, rest.signing-name, rest.signing-region

https://github.com/apache/iceberg-python/issues/1405

```
rest_catalog = load_catalog(
catalog_name,
**{
"type": "rest",
"warehouse":"arn:aws:s3tables:::bucket/",
"uri": "https://s3tables..amazonaws.com/iceberg",
"rest.sigv4-enabled": "true",
"rest.signing-name": "s3tables",
"rest.signing-region": ""
}
)
```

### Describe the solution you'd like

_No response_

### Willingness to contribute

None

Start by locating the REST catalog implementation and its configuration entry points, then trace how requests are authenticated. Compare the requested rest.sigv4-enabled, rest.signing-name, and rest.signing-region settings with the linked Python issue; done means AWS Glue/S3 Tables REST requests authenticate successfully.

Written by the indexing model from the issue text.