Renamed apps/CustomApp.py to follow snake case convention (#678)

embedchain/__init__.py

@@ -3,7 +3,7 @@ import importlib.metadata
 __version__ = importlib.metadata.version(__package__ or __name__)
 
 from embedchain.apps.App import App  # noqa: F401
-from embedchain.apps.CustomApp import CustomApp  # noqa: F401
+from embedchain.apps.custom_app import CustomApp  # noqa: F401
 from embedchain.apps.Llama2App import Llama2App  # noqa: F401
 from embedchain.apps.open_source_app import OpenSourceApp  # noqa: F401
 from embedchain.apps.PersonApp import (PersonApp,  # noqa: F401

embedchain/apps/Llama2App.py

@@ -1,6 +1,6 @@
 from typing import Optional
 
-from embedchain.apps.CustomApp import CustomApp
+from embedchain.apps.custom_app import CustomApp
 from embedchain.config import CustomAppConfig
 from embedchain.embedder.openai import OpenAiEmbedder
 from embedchain.helper.json_serializable import register_deserializable