Improve SQL module

[gerson24]

This PR closes #500 and proposes significant enhancements to the SQL module, including the ability to execute SQL queries and generate responses in a tabular format.
The changes made are as follows:

• A tabular data model consisting of columns and rows has been defined, allowing the generic representation of SQL query results.
• The module now interacts with the database using Exposed to obtain the schema data from the table names provided by the user. This eliminates the need to include the table schema information in the context.
• A function has been implemented that from a prompt, the table names and a context, returns a response with the queries and the resulting data. It also supports prompts about information about tables, about what questions you can ask or anything related to SQL.
• Code example have been included.

Documentation: xebia-functional/xef-website#24

[raulraja]

Looks great @gerson24 @tomascayuelas , thank you!

[rafaparadela]

Great work. Thanks