chore: setup for performance benchmarking (#3096)

# What does this PR do?
1. Added a simple mock openai-compat server that serves chat/completion
2. Add a benchmark server in EKS that includes mock inference server
3. Add locust (https://locust.io/) file for load testing

## Test Plan
bash apply.sh
kubectl port-forward service/locust-web-ui 8089:8089
Go to localhost:8089 to start a load test

<img width="1392" height="334" alt="image"
src="https://github.com/user-attachments/assets/d6aa3deb-583a-42ed-889b-751262b8e91c"
/>
<img width="1362" height="881" alt="image"
src="https://github.com/user-attachments/assets/6a28b9b4-05e6-44e2-b504-07e60c12d35e"
/>
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ehhuang 2025-08-13 10:58:22 -07:00 committed by GitHub
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@ -140,6 +140,9 @@ docs = [
"requests",
]
codegen = ["rich", "pydantic", "jinja2>=3.1.6"]
benchmark = [
"locust>=2.37.14",
]
[project.urls]
Homepage = "https://github.com/meta-llama/llama-stack"