Optimize summarize task prompt and others (#1533)

* 1.update prompt;
2.update fetch information method.

* 1.update prompt;
2.save result to markdown;

* 1.get context info from context_manager;
2.run the entire process successfully.

tests/finco/test_sumarize.py

@@ -0,0 +1,45 @@
+import unittest
+from dotenv import load_dotenv
+# pydantic support load_dotenv,   so load_dotenv will be deprecated in the future.
+
+from qlib.finco.task import SummarizeTask
+from qlib.finco.workflow import WorkflowContextManager
+from qlib.finco.llm import try_create_chat_completion
+
+load_dotenv(verbose=True, override=True)
+
+
+class TestSummarize(unittest.TestCase):
+
+    def test_chat(self):
+        messages = [
+            {
+                "role": "system",
+                "content": "Your are a professional financial assistant.",
+            },
+            {
+                "role": "user",
+                "content": "How to write a perfect quant strategy.",
+            },
+        ]
+        response = try_create_chat_completion(messages=messages)
+        print(response)
+
+    def test_execution(self):
+        task = SummarizeTask()
+        context = WorkflowContextManager()
+        context.set_context("output_path", "../../examples/benchmarks/Linear")
+        context.set_context("user_prompt", "My main focus is on the performance of the strategy's return."
+                                           "Please summarize the information and give me some advice.")
+        task.assign_context_manager(context)
+        resp = task.execution()
+        print(resp)
+
+    def test_parse2txt(self):
+        task = SummarizeTask()
+        resp = task.get_info_from_file('')
+        print(resp)
+
+
+if __name__ == '__main__':
+    unittest.main()