change azure engine config to modelMapper (#306)

* change azure engine config to azure modelMapper config

* Update go.mod

* Revert "Update go.mod"

This reverts commit 78d14c58f2a9ce668da43f6adbe20b60afcfe0d7.

* lint fix

* add test

* lint fix

* lint fix

* lint fix

* opt

* opt

* opt

* opt

example_test.go

@@ -305,8 +305,7 @@ func Example_chatbot() {
 func ExampleDefaultAzureConfig() {
 	azureKey := os.Getenv("AZURE_OPENAI_API_KEY")       // Your azure API key
 	azureEndpoint := os.Getenv("AZURE_OPENAI_ENDPOINT") // Your azure OpenAI endpoint
-	azureModel := os.Getenv("AZURE_OPENAI_MODEL")       // Your model deployment name
-	config := openai.DefaultAzureConfig(azureKey, azureEndpoint, azureModel)
+	config := openai.DefaultAzureConfig(azureKey, azureEndpoint)
 	client := openai.NewClientWithConfig(config)
 	resp, err := client.CreateChatCompletion(
 		context.Background(),