feat(genai): Add samples for Tools and Text-generation local images and video

[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/text_generation/textgen_with_local_video.go:18, tag googlegenaisdk_textgen_with_local_video
• genai/text_generation/textgen_with_multi_local_img.go:18, tag googlegenaisdk_textgen_with_multi_local_img
• genai/tools/tools_code_exec_with_txt_local_img.go:18, tag googlegenaisdk_tools_code_exec_with_txt_local_img

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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 expands the GenAI SDK Go samples by adding new examples for advanced multimodal capabilities. It introduces demonstrations for generating text from local video and multiple local images, as well as integrating the code execution tool with visual and textual inputs. These additions aim to provide clearer guidance and practical use cases for developers leveraging the GenAI SDK's diverse functionalities.

Highlights

• New Multimodal Text Generation Samples: Introduced new Go samples demonstrating text generation from local video files and multiple local image inputs using the GenAI SDK.
• Code Execution Tool Sample: Added a new Go sample showcasing the use of the code execution tool in conjunction with text prompts and local image inputs for the GenAI SDK.
• Expanded Test Coverage: Updated existing test files to include new test cases for the recently added local video, multi-image, and code execution samples, ensuring their functionality.

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[gemini-code-assist]

Code Review

This pull request adds several new examples for the GenAI SDK, demonstrating how to use local images, videos, and the code execution tool. The changes are well-structured and include corresponding tests. I've found one minor issue regarding string formatting that could affect the model's input, and I've provided a suggestion to fix it. Overall, this is a great addition.

[msampathkumar]

LGTM.