feat(vertextai): video with audio

[Deleplace]

Go version of the Python sample at https://github.com/GoogleCloudPlatform/python-docs-samples/blob/main/generative_ai/gemini_video_audio.py

Region tag generativeaionvertexai_gemini_video_with_audio.

[snippet-bot]

Here is the summary of changes.

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• vertexai/multimodal-video-with-audio/multimodalvideoaudio.go:18, tag generativeaionvertexai_gemini_video_with_audio

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[grayside]

Great to see this sample, it might directly help some of my own learning in this space!

[grayside]

suggestion: This sentence describes what the code does, but I think it could provide a bit more insight into the goal and what is meant by "w".

Consider addressing why the sample is interesting:

Suggested change

	// generateMultimodalContent generates a response into w, based upon the prompt
	// and video provided.
	// generateMultimodalContent shows how to send video and text prompts to a model, writing the response to the provided io.Writer.

[grayside]

blocking: Prefer error wrapping with %w in this and other locations.

[Deleplace]

kokoro failing with Test_functionCallsChat: rpc error: .... but unrelated to the current code change