feat(genai): Add samples for live generation

[cfloress]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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 4 region tags.

• genai/live/live_audio_with_txt.go:18, tag googlegenaisdk_live_audio_with_txt
• genai/live/live_code_exec_with_txt.go:18, tag googlegenaisdk_live_code_exec_with_txt
• genai/live/live_transcribe_with_audio.go:18, tag googlegenaisdk_live_transcribe_with_audio
• genai/live/live_with_txt.go:18, tag googlegenaisdk_live_with_txt

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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 introduces a suite of new samples demonstrating the 'live generation' features of the GenAI SDK, enabling real-time interactions with Gemini models for tasks such as audio synthesis, code execution, and audio transcription. Simultaneously, it refactors existing code to enhance consistency by standardizing the use of a predefined constant for the user role, contributing to a more robust and maintainable codebase.

Highlights

• New Live Generation Samples: Four new Go samples have been added under the genai/live/ directory, showcasing various real-time interaction capabilities with Gemini models. These include generating audio responses from text, executing code based on text input, transcribing audio input and output, and performing basic live text generation.
• Role Constant Refactoring: Existing genai samples have been updated to improve code consistency and maintainability. The string literal "user" used for the Role field in genai.Content has been replaced with the genai.RoleUser constant across numerous files.
• Expanded Test Coverage: The genai/live/live_examples_test.go file has been updated to include new mock functions and corresponding test cases, ensuring the functionality and proper integration of the newly introduced live generation samples.

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[gemini-code-assist]

Code Review

This pull request introduces new samples for live generation with the GenAI SDK and refactors the use of role strings to constants, which is a great improvement for code quality.

I've reviewed the changes and have the following feedback:

• The new samples are well-written, but I found a few areas for improvement, including some leftover development code (commented-out code, debug prints), a hardcoded output file path, and one case of incomplete response handling that could lead to missing the model's final answer.
• The refactoring from "user" to genai.RoleUser is applied consistently. However, I noticed one instance where this constant is used for a system instruction, which is likely incorrect.
• The refactoring seems incomplete as other role strings like "system" and "model" are still used as magic strings in the codebase. It would be great to replace them with constants as well for consistency.

I've left specific comments with suggestions on the relevant lines of code. Overall, this is a valuable addition to the samples.

[Guiners]

LGTM