Setup local Unity Catalog connection

Hello, I've tried to play and experiment with the extension on a local instance of Unity catalog. I don't errors when creating the secret and attaching the catalog, but I can't see tables.

Here's my MWE:
```python

import duckdb

duckdb.sql("""
INSTALL uc_catalog;
INSTALL delta;
LOAD delta;
LOAD uc_catalog;
CREATE OR REPLACE SECRET uc_secret (
TYPE UC,
ENDPOINT 'http://127.0.0.1:8080',

);
ATTACH IF NOT EXISTS 'test' AS test_catalog (TYPE UC_CATALOG, SECRET uc_secret);
SHOW ALL TABLES;
""")
```

I'm running unity catalog locally with docker compose, as described [here](https://docs.unitycatalog.io/docker_compose/). I've just created a catalog called _test_ which has _default_ namespace with 4 tables prebuilt.

I'm also unsure if I should add or not **TOKEN** and **AWS_REGION** even tho it's all local.
Thanks in advance.