A Llama and Llama Stack Powered Email Agent

[jeffxtang]

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What does this PR do?

This is a Llama Stack port of the Emagent app that shows how to build an email agent app powered by Llama 3.1 8B and Llama Stack, using Llama Stack custom tool and agent APIs. The end goal is to cover all components of a production-ready agent app, acting as an assistant to your email, with great user experience: intuitive, engaging, efficient and reliable. We'll use Gmail as an example but any email client API's can be used instead.

In short, provide a summary of what this PR does and why. Usually, the relevant context should be present in a linked issue.

• [ ] Addresses issue (#issue)

Test Plan

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• tests you ran to verify your changes with result summaries.
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Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ ] Ran pre-commit to handle lint / formatting issues.
• [ ] Read the contributor guideline, Pull Request section?
• [ ] Updated relevant documentation.
• [ ] Wrote necessary unit or integration tests.