Add verbose logging for debugging

[techroy23]

Summary

• Added verbose logging throughout the AdGuard Home Exporter to improve debugging and monitoring capabilities.

Changes

• Added timestamped logging for all HTTP requests (/metrics and 404s)
• Added startup configuration details (port, scrape interval, configured servers)
• Added status fetch details (running state, protection enabled, DHCP available)
• Added stats fetch details (DNS queries count, blocked count, average processing time)
• Added top clients and blocked domains logging (top 3)
• Added completion messages after successful fetches

Testing

Run the exporter with verbose output to verify:

• npm start

All timestamps are in ISO 8601 format for easy parsing.