format: expose table/view definitions in catalog metadata

### What feature or improvement would you like to see?

Extend the GetObjects schema so that at table level, there is an additional string column showing the table or view definition.

This is not typically available in JDBC/ODBC.
BigQuery: https://github.com/adbc-drivers/bigquery/issues/118 (point 7, 12)
Databricks: https://github.com/adbc-drivers/databricks/issues/236 (point 3, 5)
PostgreSQL: https://github.com/apache/arrow-adbc/issues/3971 (point 9)
Snowflake: https://github.com/adbc-drivers/snowflake/issues/77 (point 15)
Trino: https://github.com/adbc-drivers/trino/issues/60 (point 4)