support complex type when add column

[Astralidea]

Now dbt uses the following sql to detect the type

    select
        column_name,
        data_type,
        character_maximum_length,
        numeric_precision,
        numeric_scale
    from INFORMATION_SCHEMA.columns
    where table_name = '$table'
      and table_schema = '$db'
    order by ordinal_position

But starrocks does not return detailed type information Therefore, dbt considers using desc syntax to supplement detailed type information for complex types. This will partial repair fix #41 #42