feat(sample): text to sql sample app

[dineshSajwan]

Issue #, if available:

Description of changes: The "Text To SQL" generative AI sample application is a cutting-edge solution that enables users to interact with databases through natural language queries, eliminating the need for extensive SQL knowledge. Underpinning this powerful application is the Generative AI CDK (aws-text-to-sql) construct, a robust framework developed by AWS to facilitate the seamless integration of generative AI capabilities into applications.

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