feat(py): add sample test for directory and file prompt loading

[MengqinShen]

CHANGELOG:

1. Add prompt files to test variant, name and extension
2. Create a test file for prompt loading test
3. Add GoogleAI as plugin
4. Update root uv.lock and pyproject.toml

[gemini-code-assist]

Summary of Changes

Hello @MengqinShen, 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 introduces a new Python sample application (prompt_demo) designed to showcase how to load and manage prompts from a local directory using the genkit library. It provides a practical example of using load_prompt_folder to register prompts, including those with simple variable placeholders, and verifies their successful loading into the Genkit registry. This addition helps developers understand and implement prompt management within their Genkit projects.

Highlights

• New Sample Application: Introduced a new Python sample application, prompt_demo, to demonstrate prompt loading capabilities.
• Directory Prompt Loading: The sample showcases how to load multiple prompt files from a specified directory using genkit.blocks.prompt.load_prompt_folder.
• Example Prompt Files: Added several example prompt files (dot.name.test.prompt, hello.prompt, hello.variant.prompt) to illustrate different prompt structures and variable interpolation.
• Project Configuration: Included a pyproject.toml file to define the project metadata and dependencies for the new prompt_demo sample.

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[gemini-code-assist]

Code Review

This pull request adds a new sample to demonstrate loading prompts from files and directories. The implementation is straightforward and serves its purpose as a demonstration. I've identified a few areas for improvement. In the main Python script, the logic for filtering prompts can be made more robust. Additionally, the sample prompt files contain leading newlines, which will be included in the prompt content. I've suggested removing these if they are not intentional to prevent unexpected whitespace in the rendered prompts.