feat: adding responseFormat to llm.exec #8447

Job	Run time
Size Limit	3m 56s
typecheck-examples	4m 34s
Test using packages with npm	3m 42s
E2E on Node.js 22.x	3m 15s
E2E on Node.js 23.x	3m 19s
E2E on Node.js 20.x	3m 18s
Build LlamaIndex Example (cloudflare-worker-agent)	3m 21s
Build LlamaIndex Example (nextjs-node-runtime)	3m 42s
Test on Node.js 22.x	1m 49s
typecheck	3m 44s
Build LlamaIndex Example (waku-query-engine)	3m 27s
Build LlamaIndex Example (llama-parse-browser)	3m 17s
Build LlamaIndex Example (nextjs-agent)	3m 51s
Build LlamaIndex Example (nextjs-edge-runtime)	3m 45s
Build LlamaIndex Example (vite-import-llamaindex)	3m 17s
Test on Node.js 23.x	1m 40s
Test on Node.js 20.x	1m 38s
	55m 35s

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