Better S3 authentication errors

[Mytherin]

This PR improves the errors when S3 authentication fails.

For example:

select filename from read_parquet('s3://test-s3-lineitem/lineitem_sf10_partitioned_shipdate/l_shipdate=1992-01-02/data_0.parquet');

HTTP Error:
HTTP GET error reading 'https://test-s3-lineitem.s3.amazonaws.com/lineitem_sf10_partitioned_shipdate/l_shipdate%3D1992-01-02/data_0.parquet' in region 'us-east-1' (HTTP 403 Forbidden)

Authentication Failure - this is usually caused by invalid or missing credentials.
* No credentials are provided.
* See https://duckdb.org/docs/stable/extensions/httpfs/s3api.html

D select filename from read_parquet('s3://test-s3-lineitem/**');

HTTP Error:
HTTP GET error reading 's3://test-s3-lineitem/?encoding-type=url&list-type=2&prefix=' in region 'us-east-1' (HTTP 403 Forbidden)

Authentication Failure - this is usually caused by invalid or missing credentials.
* No credentials are provided.
* See https://duckdb.org/docs/stable/extensions/httpfs/s3api.html

[Mytherin]

Implemented in #50