Mark google AI models as function calling unsupported

Author: intitni

Tool/Sources/AIModel/ChatModel.swift

@@ -14,6 +14,10 @@ public struct ChatModel: Codable, Equatable, Identifiable {
         self.name = name
         self.format = format
         self.info = info
+        
+        if format == .googleAI {
+            self.info.supportsFunctionCalling = false
+        }
     }
 
     public enum Format: String, Codable, Equatable, CaseIterable {