feat(spanner-admin): spanner admin source + create instance tool

[gRedHeadphone]

Description

Added Spanner admin source to manage spanner instance and database, and added spanner create instance tool.

PR Checklist

• Make sure you reviewed
  CONTRIBUTING.md
• Make sure to open an issue as a
  bug/issue
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)
• Make sure to add ! if this involve a breaking change

🛠️ Fixes #2208

[gemini-code-assist]

Summary of Changes

Hello @gRedHeadphone, 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 significantly enhances the toolbox by integrating Google Cloud Spanner administration capabilities. It provides a new source for interacting with the Spanner Admin API and a specific tool to create Spanner instances, allowing for automated infrastructure management. The changes include core logic implementation, configuration updates, and thorough documentation to support the new features.

Highlights

• New Spanner Admin Source: Introduced a new Spanner Admin source to manage Google Cloud Spanner instances and databases, enabling AI-powered tools to interact with the Spanner Admin API.
• Spanner Create Instance Tool: Added a new tool, spanner-create-instance, which allows for the programmatic creation of Cloud Spanner instances with configurable parameters like project, instance ID, display name, configuration, node count, processing units, and edition.
• Comprehensive Documentation: New documentation files (SPANNERADMIN_README.md, spanner-admin.md, spanner-create-instance.md) have been added to detail the features, prerequisites, installation, usage, and configuration of the Spanner Admin source and tool.
• Integration Tests: A new integration test step for spanneradmin has been added to the CI pipeline, along with a dedicated integration test file (spanneradmin_integration_test.go) to ensure the new functionality works as expected.

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[gemini-code-assist]

Code Review

This pull request introduces a new spanner-admin source and a spanner-create-instance tool, complete with comprehensive documentation, unit tests, and a robust integration test. The overall implementation is of high quality and aligns well with the existing codebase patterns. My feedback includes a couple of suggestions to enhance parameter descriptions for better AI model interaction and to correct a minor formatting issue in the documentation.

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[Yuan325]

Hi, please see the following updates from #2204 . Let me know if there's any questions :) Thank you!

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[averikitsch]

@averikitsch to review and confirm any default settings.

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