feat(genai): Add samples for live generation

[cfloress]

Description

Fixes #

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• genai/live/live_conversation_audio_with_audio.go:18, tag googlegenaisdk_live_conversation_audio_with_audio
• genai/live/live_ground_ragengine_with_txt.go:18, tag googlegenaisdk_live_ground_ragengine_with_txt
• genai/live/live_text_with_audio.go:18, tag googlegenaisdk_live_txt_with_audio

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[gemini-code-assist]

Summary of Changes

Hello @cfloress, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request expands the GenAI SDK Go samples by introducing new examples for live generation features. These additions cover interactive audio conversations with transcription, grounded text generation using a Vertex RAG Store, and converting audio input into text responses. The new samples aim to illustrate advanced real-time AI capabilities and are supported by new audio processing dependencies.

Highlights

• Live Audio Conversation Sample: Introduces a new sample demonstrating real-time, two-way audio interaction with a Gemini model, including input and output transcription and saving model-generated audio.
• RAG with Text Sample: Adds a sample showcasing Retrieval Augmented Generation (RAG) using the Live API with a Vertex RAG Store for grounded text responses.
• Text Generation from Audio Sample: Provides a sample that sends audio input to a live session and receives text output from the model.
• New Audio Dependencies: Incorporates github.com/go-audio/audio, github.com/go-audio/wav, and github.com/go-audio/riff for audio processing in the new samples.

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[gemini-code-assist]

Code Review

This pull request adds several new Go samples for live generation features, including audio-to-audio conversation, text generation from audio, and RAG with a text-based corpus. The changes are generally good, but I've identified a critical compilation issue due to a likely typo in a type name, a high-severity issue with a duplicate test name, and several medium-severity opportunities to improve performance and code clarity by using more idiomatic Go for string and byte slice concatenation. The tests have also been updated to cover the new samples, but one test name needs correction.