docs: update docstrings (#565)

embedchain/config/BaseConfig.py

@@ -1,3 +1,5 @@
+from typing import Any, Dict
+
 from embedchain.helper_classes.json_serializable import JSONSerializable
 
 
@@ -7,7 +9,13 @@ class BaseConfig(JSONSerializable):
     """
 
     def __init__(self):
+        """Initializes a configuration class for a class."""
         pass
 
-    def as_dict(self):
+    def as_dict(self) -> Dict[str, Any]:
+        """Return config object as a dict
+
+        :return: config object as dict
+        :rtype: Dict[str, Any]
+        """
         return vars(self)