Added tests for `NVFoundationLLMService` and `FaissVectorDbService`

[acaklovic-nv]

Description

• Added tests for NVFoundation (test_nvfoundation_llm_client.py created)
• Added tests for FAISS (test_faiss_vector_db_service.py created)
• Changes to faiss_vdb_service.py (implemented more methods - insert, delete, count, create)
• Changes to nvfoundation_llm_service.py (api key changes in NVFoundationLLMService)

Closes

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

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[mdemoret-nv]

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[mdemoret-nv]

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