Adds a Barista Bot example.

[markmcd]

This is meant to demo a few things, so it's in /examples:

• An agent loop
• Automatic function calling in Python
• System instructions

The 1.5 quota is a little low for a case that typically expects many turns of conversation, so it uses 1.0 by default but shows both approaches.

[review-notebook-app[bot]]

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