[AUR-431] Add ReAct Agent (#34)

* add base Tool

* minor update test_tool

* update test dependency

* update test dependency

* Fix namespace conflict

* update test

* add base Agent Interface, add ReWoo Agent

* minor update

* update test

* fix typo

* remove unneeded print

* update rewoo agent

* add LLMTool

* update BaseAgent type

* add ReAct agent

* add ReAct agent

* minor update

* minor update

* minor update

* minor update

* update docstring

* fix max_iteration

---------

Co-authored-by: trducng <trungduc1992@gmail.com>

knowledgehub/pipelines/agents/react/prompt.py

@@ -0,0 +1,28 @@
+# flake8: noqa
+
+from kotaemon.prompt.template import PromptTemplate
+
+zero_shot_react_prompt = PromptTemplate(
+    template="""Answer the following questions as best you can. You have access to the following tools:
+{tool_description}.
+Use the following format:
+
+Question: the input question you must answer
+Thought: you should always think about what to do
+
+Action: the action to take, should be one of [{tool_names}]
+
+Action Input: the input to the action
+
+Observation: the result of the action
+
+... (this Thought/Action/Action Input/Observation can repeat N times)
+#Thought: I now know the final answer
+Final Answer: the final answer to the original input question
+
+Begin! After each Action Input.
+
+Question: {instruction}
+Thought:{agent_scratchpad}
+    """
+)