refactor: Add config for init, app and query (#158)

embedchain/config/ChatConfig.py

@@ -0,0 +1,8 @@
+from embedchain.config.QueryConfig import QueryConfig
+
+class ChatConfig(QueryConfig):
+    """
+    Config for the `chat` method, inherits from `QueryConfig`.
+    """
+    def __init__(self):
+        pass