feat: Add Gemini Summarize PR

[holtskinner]

No description provided.

[github-actions]

Pull Request Summary from Gemini ✨

This pull request adds a new feature to the repository: a Gemini-powered pull request summarizer.

Changes:

• .github/actions/spelling/excludes.txt: Added an exclusion for the new summarizer script.
• .github/actions/summarizer/gemini_summarize_pr.py: This new script uses the Gemini model to summarize the pull request content and adds the summary as a comment to the pull request.
• .github/workflows/gemini_summarizer.yml: This workflow triggers the summarizer script when a pull request is opened, edited, or synchronized.

Functionality:

The summarizer script uses the Gemini model to generate a concise summary of the pull request, including the title, description, changed files, code diffs, and raw file content. The summary is then added as a comment to the pull request, making it easier for reviewers to understand the changes.

Benefits:

• Improved readability: The summary provides a quick overview of the pull request, making it easier for reviewers to understand the changes.
• Time savings: Reviewers can quickly get a sense of the pull request without having to read through all the details.
• Enhanced collaboration: The summary can help to facilitate discussion and collaboration among reviewers.

This pull request is a valuable addition to the repository, providing a powerful tool for summarizing pull requests and improving the review process.

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