More JS testing

[NolanTrem]

[!IMPORTANT] Enhance JS testing for r2rClient with new retrieval tests, introduce RetrievalClient, and update API for retrieval operations.

• Testing:
  • Added RetrievalIntegrationSuperUser.test.ts for testing retrieval functionalities like search, RAG, and agent.
  • Increased timeout to 10000ms for tests in DocumentsIntegrationSuperUser.test.ts and r2rV2ClientIntegrationSuperUser.test.ts.
• Client Enhancements:
  • Introduced RetrievalClient in retrieval.ts for handling search, RAG, and agent operations.
  • Updated r2rClient in r2rClient.ts to include RetrievalClient.
• API Changes:
  • Added JavaScript code samples for retrieval endpoints in retrieval_router.py.
  • Updated retrieval_router.py to handle new retrieval operations like search, RAG, and agent.
• Miscellaneous:
  • Added sonia.txt as a test data file.

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