feat: Add intro to multimodal live api notebook

[gericdong]

Add intro to multimodal live api notebook to demonstrate the some basic examples such as

• text-to-text generation
• text-to-audio generation
• text-to-audio conversation

[review-notebook-app]

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[ghost]

Hi @gericdong and reviewers,

I'm currently reviewing this pull request and will post my detailed review in a few minutes. In the meantime, here's a quick summary to help everyone get up to speed:

This PR adds a new introductory Jupyter notebook (gemini/multimodal-live-api/intro_multimodal_live_api.ipynb) to the generative-ai repository. The notebook demonstrates basic usage of the Multimodal Live API, showcasing text-to-text generation, text-to-audio generation, and text-to-audio conversation. The notebook includes setup instructions, authentication (for Colab users), and clear examples for each functionality. It also provides links to open the notebook in various environments (Colab, Colab Enterprise, Vertex AI Workbench, and GitHub).

The changes are comprehensive, adding a complete, well-structured notebook with code examples and explanations. The notebook is well-documented and easy to follow, making it a valuable resource for users wanting to learn about the Multimodal Live API.

Happy reviewing!

Code whispers secrets,
Lines of logic entwine,
Meaning starts to bloom.

[ghost]

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[holtskinner]

Minor suggestions