Add AI Firewall metrics to Historical Stats and Real-Time Analytics APIs

apiadded

The Historical Stats API and the Real-Time Analytics API now track AI Firewall requests in AI Runtime Control via the new arc_ai_firewall_requests and arc_ai_firewall_blocked metrics.

Prior change: Route, control, and monitor AI model traffic with the new AI Runtime Control API

Following change: Add Content Guard challenge metrics to Historical Stats and Real-Time Analytics APIs