Error querying delta tables from azure storage.

[Happycipher]

1. Since the support for delta tables is added in duckdb_azure, the implementation now requires the storage account name to be mentioned explicitly while creating the azure secret using service principal. ( Line no.162 of - https://github.com/datacontract/datacontract-cli/blob/main/datacontract/engines/soda/connections/duckdb.py)

2. Otherwise, it returns [Error: IO Error: Hit DeltaKernel FFI error (from: While trying to read from delta table: 'abfss://.dfs.core.windows.net//<delta_table>/'): Hit error: 8 (ObjectStoreError) with message (Error interacting with object store: Generic MicrosoftAzure error: URL did not match any known pattern for scheme: abfss://.dfs.core.windows.net//<delta_table>/)]

3. The location present in one's datacontract.yaml should also be changed to just - abfss://container/path/to/table
   

4. As resolved in Add support to Delta files stored in ADLS Gen2 duckdb/duckdb-delta#21

[jochenchrist]

We would appreciate a pull request here, should be quite straight-forwared.