feat: Add support for Google AI (Gemini) as a custom model provider

src/models/ChatGoogleAI.ts

@@ -0,0 +1,11 @@
+import { ChatOpenAI } from "@langchain/openai";
+
+export class ChatGoogleAI extends ChatOpenAI {
+
+    frequencyPenalty: number = undefined;
+    presencePenalty: number = undefined;
+
+    static lc_name() {
+        return "ChatGoogleAI";
+    }
+}