feat: Add support for ChatFirebaseVertexAI

[davidmigloz]

The Vertex AI Gemini API gives you access to the latest generative AI models from Google: the Gemini models. If you need to call the Vertex AI Gemini API directly from your mobile or web app you can use the ChatFirebaseVertexAI class instead of the ChatVertexAI class which is designed to be used on the server-side.

ChatFirebaseVertexAI is built specifically for use with mobile and web apps, offering security options against unauthorized clients as well as integrations with other Firebase services.

await Firebase.initializeApp();
final chatModel = ChatFirebaseVertexAI(
  defaultOptions: ChatFirebaseVertexAIOptions(
    model: 'gemini-1.5-pro-preview-0514',
  ),
);

Check out the sample project to see a complete project using Vertex AI for Firebase.

[davidmigloz]

Docs: https://langchaindart.com/#/modules/model_io/models/chat_models/integrations/firebase_vertex_ai