feat(agent): Add retrieve summary agent for both local files and URLs (#1063)

Co-authored-by: fangfcg <thss15_fangcg@163.com>

examples/agents/retrieve_summary_agent_dialogue_example.py

@@ -0,0 +1,66 @@
+"""Agents: single agents about CodeAssistantAgent?
+
+    Examples:
+     
+        Execute the following command in the terminal:
+        Set env params.
+        .. code-block:: shell
+
+            export OPENAI_API_KEY=sk-xx
+            export OPENAI_API_BASE=https://xx:80/v1
+
+        run example.
+        ..code-block:: shell
+            python examples/agents/retrieve_summary_agent_dialogue_example.py
+"""
+
+import asyncio
+import os
+
+from dbgpt.agent.agents.agent import AgentContext
+from dbgpt.agent.agents.expand.retrieve_summary_assistant_agent import (
+    RetrieveSummaryAssistantAgent,
+)
+from dbgpt.agent.agents.user_proxy_agent import UserProxyAgent
+from dbgpt.agent.memory.gpts_memory import GptsMemory
+from dbgpt.core.interface.llm import ModelMetadata
+
+
+def summary_example_with_success():
+    from dbgpt.model import OpenAILLMClient
+
+    llm_client = OpenAILLMClient()
+    context: AgentContext = AgentContext(
+        conv_id="retrieve_summarize", llm_provider=llm_client
+    )
+    context.llm_models = [ModelMetadata(model="gpt-3.5-turbo-16k")]
+
+    default_memory = GptsMemory()
+    summarizer = RetrieveSummaryAssistantAgent(
+        memory=default_memory, agent_context=context
+    )
+
+    user_proxy = UserProxyAgent(memory=default_memory, agent_context=context)
+
+    asyncio.run(
+        user_proxy.a_initiate_chat(
+            recipient=summarizer,
+            reviewer=user_proxy,
+            message="""I want to summarize advantages of Nuclear Power. 
+            You can refer the following file pathes and URLs: ['/home/ubuntu/DB-GPT/examples/Nuclear_power.pdf', 'https://en.wikipedia.org/wiki/Modern_Family', '/home/ubuntu/DB-GPT/examples/Taylor_Swift.pdf', 'https://en.wikipedia.org/wiki/Chernobyl_disaster']
+            """,
+        )
+    )
+
+    ## dbgpt-vis message infos
+    print(asyncio.run(default_memory.one_plan_chat_competions("retrieve_summarize")))
+
+
+if __name__ == "__main__":
+    print(
+        "\033[92m=======================Start The Summary Assistant with Successful Results==================\033[0m"
+    )
+    summary_example_with_success()
+    print(
+        "\033[92m=======================The Summary Assistant with Successful Results Ended==================\n\n\033[91m"
+    )