HDDS-14816. Add Recon AI Assistant backend foundation with Google Gemini integration

[ArafatKhan2198]

What changes were proposed in this pull request?

What the Recon AI Chatbot Does

The Recon AI Assistant is a chatbot that lets users ask questions about the system using normal English instead of manually calling REST APIs.

Instead of a user needing to know which API endpoint to call, the chatbot understands the question, calls the correct API internally, and returns a simple explanation of the result.

Example:

User question:

“How many datanodes are unhealthy?”

Normally the user would have to:

1. Know the correct API endpoint
2. Call the API
3. Read the JSON response
4. Interpret the result

With the chatbot:

1. The user asks the question in plain English.
2. The chatbot figures out which API to call.
3. It calls the API automatically.
4. It summarizes the result in simple language.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-14816

How was this patch tested?