Renamed apps/App.py to follow snake case convention (#708)

embedchain/__init__.py

@@ -2,7 +2,7 @@ import importlib.metadata
 
 __version__ = importlib.metadata.version(__package__ or __name__)
 
-from embedchain.apps.App import App  # noqa: F401
+from embedchain.apps.app import App  # 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

embedchain/apps/PersonApp.py

@@ -1,6 +1,6 @@
 from string import Template
 
-from embedchain.apps.App import App
+from embedchain.apps.app import App
 from embedchain.apps.open_source_app import OpenSourceApp
 from embedchain.config import BaseLlmConfig
 from embedchain.config.apps.base_app_config import BaseAppConfig