chore: import upstream snapshot with attribution

rdagent/components/coder/CoSTEER/task.py

@@ -0,0 +1,9 @@
+from rdagent.core.experiment import Task
+
+
+class CoSTEERTask(Task):
+    def __init__(self, base_code: str = None, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+        # TODO: we may upgrade the base_code into a workspace-like thing to know previous.
+        # NOTE: (xiao) think we don't need the base_code anymore. The information should be retrieved from the workspace.
+        self.base_code = base_code