Migrate the MVP into kotaemon (#108)

- Migrate the MVP into kotaemon.
- Preliminary include the pipeline within chatbot interface.
- Organize MVP as an application.

Todo:

- Add an info panel to view the planning of agents -> Fix streaming agents' output.

Resolve: #60
Resolve: #61 
Resolve: #62

knowledgehub/indices/qa/citation.py

@@ -64,11 +64,7 @@ class CitationPipeline(BaseComponent):
 
     llm: BaseLLM
 
-    def run(
-        self,
-        context: str,
-        question: str,
-    ) -> QuestionAnswer:
+    def run(self, context: str, question: str):
         schema = QuestionAnswer.schema()
         function = {
             "name": schema["title"],