New Workers pricing — never pay to wait on I/O again

Introduced a new pricing model for Cloudflare Workers and Pages Functions that bills based on CPU time instead of duration. This change addresses the issue of customers paying for idle time spent waiting on I/O operations. The new model is designed to be more cost-effective, especially for applications with high I/O wait times or long-running AI inference requests. It also includes features for setting maximum CPU time limits per Worker project.