add response_format api.py

[hanzlfs]

What does this PR do?

Closes # (issue) #148

Feature/Issue validation/testing/test plan

Please describe the tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration or test plan.

• Test A
  PYTHONPATH=. python examples/interior_design_assistant/api.py localhost 5000 examples/interior_design_assistant/resources/documents/ examples/interior_design_assistant/resources/images/fireplaces

llamastack/llama-stack-client-python#72

• Test B
  Logs for Test B

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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