Add Qdrant vector database support

[Dewaldnel11]

Summary

• add a Qdrant REST wrapper to the JavaScript SDK vector-db package without introducing a Qdrant client dependency
• support collection creation, point upsert, vector search, point lookup, and delete-by-id operations
• export Qdrant types from the vector-db entrypoint
• document basic Qdrant usage in the package README

Verification

• npm run build
• npx vitest src/vector-db/src/tests/qdrant/qdrant.test.ts --run

/claim #273

[github-actions]

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[Dewaldnel11]

I have read the Arakoo CLA Document and I hereby sign the CLA

[Dewaldnel11]

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