feat: add `@llamaindex/readers` package #5893

Job	Run time
E2E on Node.js 18.x	3m 22s
E2E on Node.js 20.x	3m 10s
typecheck	2m 54s
E2E on Node.js 22.x	3m 23s
Test on Node.js 18.x	3m 4s
Build LlamaIndex Example (cloudflare-worker-agent)	2m 41s
Test on Node.js 20.x	2m 59s
Build LlamaIndex Example (nextjs-agent)	3m 19s
typecheck-examples	3m 19s
Test on Node.js 22.x	3m 1s
Build LlamaIndex Example (nextjs-edge-runtime)	2m 57s
Build LlamaIndex Example (nextjs-node-runtime)	2m 53s
Build LlamaIndex Example (waku-query-engine)	3m 19s
Build LlamaIndex Example (llama-parse-browser)	2m 45s
	43m 6s

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