Allow disabling remote signing in REST Catalog

### Feature Request / Improvement

When using a REST Catalog (e.g. Lakekeeper), pyiceberg gets remote signing details from the catalog.

However, sometimes it would be useful to _not_ use remote signing, in the case where the process performing the operations has access to the S3 endpoint through secret access keys. This is because remote signing requires a network round trip (plus any authorisation on server side).

It would be great if we could disable remote signing by respecting the `s3.signer` catalog property if it is empty.

The FileIO object gets created in `pyiceberg/catalog/rest/__init__.py`:

```python
return Table(
identifier=identifier_tuple,
metadata_location=table_response.metadata_location, # type: ignore
metadata=table_response.metadata,
io=self._load_file_io(
{**table_response.metadata.properties, **table_response.config}, table_response.metadata_location
),
catalog=self,
config=table_response.config,
)
```

This doesn't use the catalog properties that have been passed to the REST catalog init as far as I can tell.

I might be wrong, but I don't think [Support storage-credentials in REST catalog LoadTableResult- #3042
](https://github.com/apache/iceberg-python/pull/3042) fixes this, because it still uses the response from the catalog.

Thanks!

Inizia in pyiceberg/catalog/rest/__init__.py, nella costruzione di Table, e analizza come le proprietà del catalogo REST arrivano alla configurazione di FileIO. Segui la gestione di s3.signer, quindi verifica che una proprietà del catalogo vuota disabiliti la firma remota senza compromettere il comportamento esistente della configurazione della risposta.

Scritto dal modello di indicizzazione a partire dal testo della issue.