[Feature]: Add support for creating app using yaml config (#787)

tests/llm/test_vertex_ai.py

@@ -1,9 +1,11 @@
-import pytest
 from unittest.mock import MagicMock, patch
-from embedchain.llm.vertex_ai import VertexAiLlm
-from embedchain.config import BaseLlmConfig
+
+import pytest
 from langchain.schema import HumanMessage, SystemMessage
 
+from embedchain.config import BaseLlmConfig
+from embedchain.llm.vertex_ai import VertexAiLlm
+
 
 @pytest.fixture
 def vertexai_llm():