Provide aggregated `live_stats` info

## Summary

Provide aggregated live stats for all agents currently available in the control panel which currently assumed by client side. Consider future needs for extracting history data during development.

Implement live stat resolver. Previously retrieved from Redis stats, but now changed to retrieve via Prometheus metrics.

## Context

This feature aims to enhance the `live_stats` of agents. It is essential to keep in mind the potential need for historical data extraction.

## Acceptance criteria

- Display live stats for all agents.
- Ensure the system is designed to allow for future history extraction.

## Other information

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JIRA Issue: BA-3075