feat: added useAIGateway interceptor examples for providers#26727

roerohan wants to merge 2 commits intoproductioncloudflare/cloudflare-docs:productionfrom

revert-26718-revert-26560-rmukherjee/use-ai-gateway-interceptorcloudflare/cloudflare-docs:revert-26718-revert-26560-rmukherjee/use-ai-gateway-interceptorCopy head branch name to clipboard