Add Iceberg catalog support

[ediril]

This PR adds support for attaching an Iceberg catalog and be able to read iceberg tables from a datalake. It specifically supports the following sql commands:

1. Create an ICEBERG secret to access your catalog

CREATE SECRET (
     TYPE ICEBERG,
     CLIENT_ID <your-catalog-client-id>,
     CLIENT_SECRET <your-catalog-client-secret>,
     ENDPOINT 'https://<your-catalog-host>/api/catalog',
     AWS_REGION 'us-east-1'
);

2. Attach your catalog

ATTACH 'my_catalog' AS my_datalake (TYPE ICEBERG);

3. Select your iceberg tables in the datalake via the catalog

SHOW ALL TABLES;

SELECT * FROM my_datalake.schema.table;