Add sample code for model_selection_config

[yan283]

Description

Fixes #

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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]

Hello @yan283, 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!

Summary of Changes

This pull request adds sample code for model_selection_config to the text_generation example. It updates the google-genai dependency to version 1.11.0 and modifies the code to include ModelSelectionConfig in the GenerateContentConfig when calling the generate_content method. The API version is also updated to v1beta1.

Highlights

• Model Selection Configuration: The pull request introduces the use of ModelSelectionConfig to specify feature selection preferences when generating content.
• API Version Update: The API version is updated from v1 to v1beta1 to support the new ModelSelectionConfig feature.
• Dependency Update: The google-genai dependency is updated from version 1.7.0 to 1.11.0.

Changelog

• genai/text_generation/model_optimizer_textgen_with_txt.py
  • Imports FeatureSelectionPreference, GenerateContentConfig, and ModelSelectionConfig from google.genai.types.
  • Updates the Client initialization to use api_version="v1beta1".
  • Adds a config parameter to the generate_content call, including a model_selection_config with a feature_selection_preference set to FeatureSelectionPreference.BALANCED.
• genai/text_generation/requirements.txt
  • Updates the google-genai dependency from version 1.7.0 to 1.11.0.

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A model's selection,
Configs shape its perfection,
AI's guiding hand.

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[gemini-code-assist]

Code Review

The pull request introduces the model_selection_config to the text generation example, allowing users to specify a preference for model selection (quality vs. cost). The code changes look good overall, but there are a few minor suggestions for improvement.

Merge Readiness

The code changes are well-structured and introduce a useful feature. I recommend addressing the comments before merging. I am unable to directly approve this pull request, and recommend that others review and approve this code before merging.