Enforce all IO objects to be subclassed from Document (#88)

* enforce Document as IO

* Separate rerankers, splitters and extractors (#85)

* partially refractor importing

* add text to embedding outputs

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Co-authored-by: Nguyen Trung Duc (john) <trungduc1992@gmail.com>

knowledgehub/contribs/promptui/config.py

@@ -5,8 +5,9 @@ from typing import Any, Dict, Optional, Type, Union
 
 import yaml
 
-from ...base import BaseComponent
-from ...chatbot import BaseChatBot
+from kotaemon.base import BaseComponent
+from kotaemon.chatbot import BaseChatBot
+
 from .base import DEFAULT_COMPONENT_BY_TYPES