Flight SQL Support

Add support for Flight SQL in addition to base Flight proto:

https://github.com/apache/arrow-rs/tree/master/arrow-flight/src/sql

The issue references the arrow-flight/src/sql directory in the arrow-rs repository. Start by examining the existing Flight SQL implementation there to understand the protocol extensions. The CLI likely needs new commands or flags to handle Flight SQL queries. Look at the current command structure and data handling in the arrow-flight-cli codebase to see where to integrate the new support.

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