Query Cloudflare Radar and our docs using ChatGPT plugins

Introduced two new Cloudflare ChatGPT plugins: one for Cloudflare Radar, enabling natural language queries of Internet patterns via an enriched OpenAPI schema and itty-router-openapi, and another for Cloudflare Docs, using KV as a vector store for up-to-date documentation retrieval and Cron Triggers for index updates. This extends the capabilities of Cloudflare Radar by providing a new interface for data exploration and enhances developer experience by allowing natural language access to documentation.