feat: Initial version if Graph RAG in KAGGLE scenario (#301)

* Initial version if Graph RAG in KAGGLE scenario

* fix CI

* fix a small bug

* fix CI

* fix CI

* fix CI

rdagent/core/knowledge_base.py

@@ -0,0 +1,25 @@
+from pathlib import Path
+
+import dill as pickle  # type: ignore[import-untyped]
+
+from rdagent.log import rdagent_logger as logger
+
+
+class KnowledgeBase:
+    def __init__(self, path: str | Path | None = None) -> None:
+        self.path = Path(path) if path else None
+        self.load()
+
+    def load(self) -> None:
+        if self.path is not None and self.path.exists():
+            with self.path.open("rb") as f:
+                self.__dict__.update(
+                    pickle.load(f).__dict__,
+                )  # TODO: because we need to align with init function, we need a less hacky way to do this
+
+    def dump(self) -> None:
+        if self.path is not None:
+            self.path.parent.mkdir(parents=True, exist_ok=True)
+            pickle.dump(self, self.path.open("wb"))
+        else:
+            logger.warning("KnowledgeBase path is not set, dump failed.")