feat(genai): Add function calling config sample

[amcolin]

Description

implemented a new sample that migrate existing logic to the genai library, ensuring full alignment with the provided other language examples. https://docs.cloud.google.com/gemini-enterprise-agent-platform/reference/models/function-calling.md#advanced-use

Fixes Internal b/527541512

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

[gemini-code-assist]

Warning

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[amcolin]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new example demonstrating how to configure Gemini function calling using genai.FunctionCallingConfig, along with a corresponding test case. The review feedback suggests adding region tags for documentation, correcting several typos in variable names, descriptions, and error messages, and ensuring all output is written to the provided io.Writer instead of standard output for better testability.

[amcolin]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new example demonstrating how to configure function calling with the Gemini model. Specifically, it adds genai/tools/tools_func_calling_config.go containing the generateWithFuncCallConfig function, which sets up a function declaration and restricts the model to only use that function using FunctionCallingConfig. Additionally, a corresponding unit test has been added to genai/tools/tools_examples_test.go to verify the behavior. I have no feedback to provide.

[Kef131]

Great sample, it is consistent with others samples

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• genai/tools/tools_func_calling_config.go:18, tag aiplatform_genai_func_calling_config

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