Refine all the implementation code to higher quality for release (#29)

* refine CI script

* refine all the code to higher quality

* refine the script to factor extraction and implementation

* add task loader interface

* add a task loader interface && move pdf analysis to pdf task loader

* change the name to global variables

---------

Co-authored-by: xuyang1 <xuyang1@microsoft.com>

rdagent/core/task.py

@@ -2,13 +2,16 @@ from abc import ABC, abstractmethod
 from typing import Tuple
 import pandas as pd
 
-'''
+"""
 This file contains the all the data class for rdagent task.
-'''
+"""
+
+
 class BaseTask(ABC):
     # 把name放在这里作为主键
     pass
 
+
 class TaskImplementation(ABC):
     def __init__(self, target_task: BaseTask) -> None:
         self.target_task = target_task
@@ -17,6 +20,7 @@ class TaskImplementation(ABC):
     def execute(self, *args, **kwargs) -> Tuple[str, pd.DataFrame]:
         raise NotImplementedError("__call__ method is not implemented.")
 
+
 class TestCase:
     def __init__(
         self,
@@ -26,3 +30,8 @@ class TestCase:
         self.ground_truth = ground_truth
         self.target_task = target_task
 
+
+class TaskLoader:
+    @abstractmethod
+    def load(self, *args, **kwargs) -> BaseTask | list[BaseTask]:
+        raise NotImplementedError("load method is not implemented.")