Sync updates from stainless branch: hardikjshah/dev

[hardikjshah]

Add client side resources for

• files
• vector_stores
• embeddings

Installed this package and tested llama-stack integration tests -

# files 
pytest -sv --stack-config=http://localhost:8321  tests/integration/files/test_files.py

# embeddings 
pytest -sv --stack-config=http://localhost:8321  tests/integration/inference/test_openai_embeddings.py --embedding-model all-MiniLM-L6-v2

# vector stores 
pytest -sv --stack-config=http://localhost:8321 tests/integration/vector_io/test_openai_vector_stores.py --embedding-model all-MiniLM-L6-v2