Add support for AUTHORIZATION_TYPE 'none' (Nessie, Lakekeeper (in no-auth mode))

[Tishj]

This PR adds the ability to connect to Lakekeeper with LAKEKEEPER_CATALOGS_DEMO_AUTHORIZATION_TYPE=none

Thanks to duckdb/duckdb#17813 for motivating and providing a working reproducer.
As a side effect of working on this, I discovered that this connection is already possible on main (I think v1.3.0 release as well) using:

attach 'demo' as my_datalake (
	type ICEBERG,
	ENDPOINT 'http://localhost:8181/catalog',
	TOKEN ''
);

By supplying the TOKEN, we won't try to hit any authorization server, the only functional difference is that with this branch we won't send a Bearer token with the request, whereas on main we do send a Bearer token, but that should be ignored anyways if the authorization type is None on the Catalog server.

With this PR, this becomes possible instead:

attach 'demo' as my_datalake (
	type ICEBERG,
        AUTHORIZATION_TYPE 'NONE',
	ENDPOINT 'http://localhost:8181/catalog'
);