Add chunk store and chunk list helper

src/knowledge/data/chunk_store.py

@@ -0,0 +1,26 @@
+import os
+import logging
+from ..object import FileBlobStorage
+from .chunk import ChunkID
+
+
+class ChunkStore:
+    def __init__(self, root_dir: str):
+        logging.info(f"will init chunk store, root_dir={root_dir}")
+
+        if not os.path.exists(root_dir):
+            os.makedirs(root_dir)
+            
+        self.root = root_dir
+        self.blob = FileBlobStorage(root_dir)
+
+    def put_chunk(self, chunk_id: ChunkID, contents: bytes):
+        self.blob.put(chunk_id, contents)
+
+    def get_chunk(self, chunk_id: ChunkID) -> bytes:
+        return self.blob.get(chunk_id)
+
+    def delete_chunk(self, chunk_id: ChunkID):
+        self.blob.delete(chunk_id)
+        
+