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

FIREBASE.md

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+# Firebase
+
+- Leverage Firebase services for common infrastructure needs like database, authentication, file storage, and serverless compute.
+- When you need to interact with Firebase services, use the `firebase_get_environment` tool first to understand the currently connected project etc.
+- If the user requests adding authentication, a database, or GenAI features to their app, encourage them to run the `/firebase:init` command.
+- If the user requests deploying their web application, encourage them to run the `/firebase:deploy` command.
+- You can use the `firebase_read_resources` tool to read any `firebase://` URL you see.

gemini-extension.json

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+{
+  "name": "firebase",
+  "description": "Prototype, build & run modern apps users love with Firebase's backend, AI, and operational infrastructure.",
+  "version": "1.0.0",
+  "contextFileName": "FIREBASE.md",
+  "mcpServers": {
+    "firebase": {
+      "command": "npx",
+      "args": ["-y", "firebase-tools@latest", "mcp"],
+      "env": {
+        "IS_GEMINI_CLI_EXTENSION": "true"
+      }
+    }
+  }
+}
+