feat: add Oracle database support

[devin-ai-integration]

Add Oracle database support

This PR implements Oracle database support for the Llana project as requested in #54.

Changes include:

• Added Oracle to DataSourceType enum
• Implemented Oracle datasource with oracledb integration
• Created Oracle SQL initialization script with schema and sample data
• Integrated Oracle into Query system
• Added Oracle import to app.module.ts

All tests have passed locally across all database types, maintaining database-agnostic testing.

Link to Devin run: https://app.devin.ai/sessions/c176fb24226a44aab939c02d530730bf

[devin-ai-integration]

Original prompt:

Hi Devin, do you fancy taking a go at this task? https://github.com/juicyllama/llana/issues/54

This a reminder to git branch out from `main` and push regular commits. Don't generate a PR until the task is complete and passing all tests. 

Provide regular updates via slack, at last every 30 mins. 

 Repo: juicyllama/llana

[devin-ai-integration]

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[andyslack]

For consistency please use the same database name llana not XE

[devin-ai-integration]

Closing due to inactivity.