chore: add repo-metadata.json

[parthea]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello, 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 adds a new .repo-metadata.json file to the repository. This file is crucial for defining standardized metadata about the sqlalchemy-spanner project, including its name, documentation links, issue tracker, release level, and language. This addition helps in automated tooling and consistent project information management.

Highlights

• New Metadata File: Introduced the .repo-metadata.json file to define standardized metadata for the sqlalchemy-spanner project.

Changelog

• .repo-metadata.json
  • Added a new metadata file for repository configuration.

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[gemini-code-assist]

Code Review

This pull request introduces the .repo-metadata.json file, which is a standard practice for Google Cloud repositories to provide metadata. The information is largely accurate, but there's an inconsistency in the issue_tracker URL. It currently points to Google's Issue Tracker, whereas the project's README.rst directs users to GitHub Issues. I've added a comment to align these for a consistent user experience.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[gemini-code-assist]

The issue_tracker URL points to Google's Issue Tracker, but the README.rst file (lines 15-17 and 552-553) directs users to file issues on GitHub. To avoid confusion and provide a consistent experience for contributors, this URL should point to the GitHub repository's issues page.

Suggested change

	"issue_tracker": "https://issuetracker.google.com/issues?q=componentid:190851%2B%20status:open",
	"issue_tracker": "https://github.com/googleapis/python-spanner-sqlalchemy/issues",

[parthea]

https://issuetracker.google.com/issues?q=componentid:190851%2B%20status:open is a public issue tracker