feat(genai): add tool samples (1)

[jdomingr]

Add new tool samples

Code execution with text
Google Search with text
Url context with text
Function calling with text

All local tests have passed

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• genai/api/GenAI.Samples/Tools/ToolsCodeExecWithTxt.cs:17, tag googlegenaisdk_tools_code_exec_with_txt
• genai/api/GenAI.Samples/Tools/ToolsFuncDescWithTxt.cs:17, tag googlegenaisdk_tools_func_desc_with_txt
• genai/api/GenAI.Samples/Tools/ToolsGoogleSearchWithTxt.cs:17, tag googlegenaisdk_tools_google_search_with_txt
• genai/api/GenAI.Samples/Tools/ToolsUrlContextWithTxt.cs:17, tag googlegenaisdk_tools_urlcontext_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @jdomingr, 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 expands the GenAI SDK's sample suite by introducing four new examples that illustrate the usage of various powerful tools: code execution, Google Search, URL context, and function calling, all integrated with text-based interactions. These additions aim to provide clearer guidance and practical demonstrations for developers looking to incorporate these advanced AI capabilities into their applications.

Highlights

• Code Execution Sample: Introduced a new sample demonstrating how to use the GenAI SDK for code execution with text input, including a test for its functionality.
• Google Search Sample: Added a new sample showcasing the integration of Google Search with text input via the GenAI SDK, along with a corresponding test.
• URL Context Sample: Implemented a new sample that illustrates how to leverage URL context with text input using the GenAI SDK, complete with a dedicated test.
• Function Calling Sample: Provided a new sample demonstrating function calling capabilities with text input and function declarations in the GenAI SDK, accompanied by a test.

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[gemini-code-assist]

Code Review

This pull request introduces several new samples for GenAI tools. The code is generally well-structured and clear. However, I've identified a recurring pattern of unsafe access to collection elements in the API response handling across multiple files. This could lead to runtime exceptions if the API returns an empty list. I've provided suggestions to use safer methods like FirstOrDefault() with null-conditional operators to improve the robustness of the samples.