feat: add `@llamaindex/readers` package #5896

Job	Run time
typecheck	3m 6s
Build LlamaIndex Example (cloudflare-worker-agent)	3m 1s
Test on Node.js 18.x	3m 18s
E2E on Node.js 18.x	3m 52s
Test on Node.js 20.x	3m 21s
Build LlamaIndex Example (nextjs-agent)	4m 1s
typecheck-examples	3m 27s
E2E on Node.js 20.x	3m 17s
Build LlamaIndex Example (nextjs-edge-runtime)	3m 24s
Test on Node.js 22.x	2m 55s
E2E on Node.js 22.x	3m 43s
Build LlamaIndex Example (nextjs-node-runtime)	3m 45s
Build LlamaIndex Example (waku-query-engine)	3m 27s
Build LlamaIndex Example (llama-parse-browser)	2m 46s
	47m 23s

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