feat(genai): add new code-execution code samples

[msampathkumar]

These code samples demonstrate usage of Gemini's ability to dynamically generate required code and then execute it.

Description

Fixes b479135143

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

Checklist

• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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/code_execution/codeexecution_annotateimage_with_txt_gcsimg.py:17, tag googlegenaisdk_codeexecution_annotateimage_with_txt_gcsimg
• genai/code_execution/codeexecution_barplot_with_txt_img.py:17, tag googlegenaisdk_codeexecution_barplot_with_txt_img
• genai/code_execution/codeexecution_cropimage_with_txt_img.py:17, tag googlegenaisdk_codeexecution_cropimage_with_txt_img

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[iennae]

Missing Image Sources & Context

Thanks for the work on this. We need to establish a clear audit trail for the images included in this PR, specifically regarding their origin.

Please add a file named IMAGE_SOURCES.md that references every image file. For each image, please specify:

Source Type: (e.g., AI Generated, Stock/Licensed, or Self-Created).

Origin/Context:

• If AI Generated: Please provide the tool used and the prompt/context.
• If External: Provide the direct link and license type.
• If Self-Created: Just confirm it was created manually by you.

The file could have something like

File Name / Path	Source Type	Origin / Link	Context / Attribution / Prompt
example.png	AI Generated	Midjourney	Prompt: "A futuristic city skyline..."
example.jpg	External	[Link to source]	CC0 License / Author Name
example.svg	Manual	Self	Created in Figma
[Real Image 1]
[Real Image 2]