agents to use tools api

[dineshyv]

What does this PR do?

Agents to use tools API

Test Plan

pytest -s -v -k fireworks llama_stack/providers/tests/agents/test_agents.py  \
   --safety-shield=meta-llama/Llama-Guard-3-8B \
   --inference-model=meta-llama/Llama-3.1-8B-Instruct

pytest -s -v -k together  llama_stack/providers/tests/tools/test_tools.py \
   --safety-shield=meta-llama/Llama-Guard-3-8B \
   --inference-model=meta-llama/Llama-3.1-8B-Instruct

LLAMA_STACK_CONFIG="/Users/dineshyv/.llama/distributions/llamastack-together/together-run.yaml" pytest -v tests/client-sdk/agents/test_agents.py

run.yaml: https://gist.github.com/dineshyv/0365845ad325e1c2cab755788ccc5994

Notebook: https://colab.research.google.com/drive/1ck7hXQxRl6UvT-ijNRZ-gMZxH1G3cN2d?usp=sharing

[ashwinb]

maybe have a unit test just for this behavior, seems very key

[ashwinb]

we need to make sure the code interpreter tool has a filesystem API -- at least something minimal so we can pass auxilliary "content" to a remote provider for code execution