feat(gcli-extension): Add GCLI extension to `firebase-tools` repo

[richieforeman]

Description

Publish firebase tools GCLI extension.

Scenarios Tested

Sample Commands

[gemini-code-assist[bot]]

Summary of Changes

Hello @richieforeman, I'm Gemini Code Assist[^1]! 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 integrates a new Gemini CLI extension into the firebase-tools repository. The extension aims to streamline developer workflows by allowing AI models to interact with Firebase services through a defined context and command execution mechanism. This enhancement facilitates AI-driven development for tasks such as database management, authentication, and application deployment within the Firebase ecosystem.

Highlights

• New Gemini CLI Extension: This pull request introduces a new Gemini CLI extension for Firebase, enabling AI-powered interactions with Firebase services.
• Firebase Context File: A new markdown file, FIREBASE.md, has been added to serve as the context for the Gemini extension, guiding its understanding and interaction with Firebase services and tools like firebase_get_environment, firebase:init, firebase:deploy, and firebase_read_resources.
• Extension Configuration: The gemini-extension.json file has been added to define the 'firebase' extension, linking it to the FIREBASE.md context file and configuring the execution of firebase-tools@latest mcp via npx with a specific environment variable (IS_GEMINI_CLI_EXTENSION) for its operation.

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