feat(genai): Add samples for live ground, func call and structured 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_func_call_with_txt.go:18, tag googlegenaisdk_live_func_call_with_txt
• genai/live/live_ground_googsearch_with_txt.go:18, tag googlegenaisdk_live_ground_googsearch_with_txt
• genai/live/live_structured_ouput_with_txt.go:18, tag googlegenaisdk_live_structured_ouput_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 significantly enhances the genai Go samples by introducing three new examples that demonstrate advanced capabilities of the Gemini model. These include live grounding with Google Search for more accurate and up-to-date responses, live function calling to enable model interaction with external tools, and structured output generation for parsing model responses into predictable JSON formats. These additions provide valuable resources for developers looking to leverage the full potential of the GenAI SDK.

Highlights

• Live Grounding with Google Search: New sample demonstrating how to use the Gemini model with Google Search for grounded responses, enhancing the model's ability to provide accurate and up-to-date information.
• Live Function Calling: New sample showcasing live function calls with text input, allowing the Gemini model to interact with predefined tools and execute actions based on user prompts.
• Structured Output Generation: New sample illustrating how to generate structured JSON output from text using the Gemini model, facilitating easier parsing and integration of model responses into applications.
• New Test Coverage: Addition of a new test file (live_examples_test.go) to validate the functionality of these new live generation samples, ensuring their correctness and reliability.

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[gemini-code-assist]

Code Review

This pull request adds several new Go samples for GenAI live features, including grounded generation, function calling, and structured output. The code is generally well-structured, but there are a few issues to address.

In live_func_call_with_txt.go, there's a potential resource leak as the LiveSession is not closed, and a bug in handling tool call responses where responses are accumulated across calls.
In live_structured_ouput_with_txt.go, errors during JSON parsing are suppressed, which could lead to silent failures in tests.
The test file live_examples_test.go contains a leftover debug print statement.
The live_ground_googsearch_with_txt.go sample has inconsistent output handling, mixing writes to os.Stdout and the provided io.Writer.

Additionally, there's a typo in the filename genai/live/live_structured_ouput_with_txt.go (should be output).

I've added specific comments with suggestions for fixes.