feat(core): register timestamptz type to DataFusion timestamp with time zone type

[goldmedal]

Description

Now we can distinguish TIMESTAMP and TIMESTAMP WITH TIME ZONE in the DataFusion layer. We also know the sqlglot will transpile SQL for Bigquery

• TIMESTAMP -> DATETIME ( without timezone)
• TIMESTAMP WITH TIME ZONE -> TIMESTAMP ( with timezone)

We can apply DataFusion's type coercion rule for them. If needed, DataFusion will cast the timestamp side to the timestamp with the time zone.

Additional change

• Enhance the validation script. Now we can set the log level for the detailed debug information.

  LOGURU_LEVEL=DEBUG python tools/mdl_validation.py mdl.json function.csv

• add boolean alias for bool type
• add required function current_datetime for BigQuery

[goldmedal]

Thanks @grieve54706 for reviewing