Backend: Add functionality to export Neuvector Data Metrics to Prometheus

Description:

Add functionality in the backend to export NeuVector data metrics to Prometheus for real-time monitoring and visualization.

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Tasks:

1. Integration with Prometheus

   • Set up a Prometheus metrics endpoint in the backend.
   • Define and register custom metrics for NeuVector (e.g.,compliance data).

2. Data Processing

   • Fetch NeuVector data using the existing client.
   • Parse and transform the data into Prometheus-compatible metrics.

3. Metrics Export

   • Push the transformed metrics to the Prometheus endpoint.
   • Ensure proper labeling (e.g., namespace, pass/fail, contorl).

4. Error Handling and Logging

   • Handle errors during data fetching, transformation, and export.
   • Implement logging for debugging and monitoring.

5. Testing

   • Write unit tests for metric transformation and export logic.
   • Perform integration tests with Prometheus to validate metric ingestion.

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