Feat: add_chunk supports add image (#13629)

### What problem does this PR solve?

Add_chunk supports add image.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

api/utils/image_utils.py

@@ -0,0 +1,40 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+from io import BytesIO
+
+from PIL import Image
+
+from common import settings
+
+
+def store_chunk_image(bucket, name, image_binary):
+    if settings.STORAGE_IMPL.obj_exist(bucket, name):
+        old_binary = settings.STORAGE_IMPL.get(bucket, name)
+        old_img = Image.open(BytesIO(old_binary))
+        new_img = Image.open(BytesIO(image_binary))
+        old_img = old_img.convert("RGB")
+        new_img = new_img.convert("RGB")
+        width = max(old_img.width, new_img.width)
+        height = old_img.height + new_img.height
+        combined = Image.new("RGB", (width, height), (255, 255, 255))
+        combined.paste(old_img, (0, 0))
+        combined.paste(new_img, (0, old_img.height))
+        buf = BytesIO()
+        combined.save(buf, format="JPEG")
+        settings.STORAGE_IMPL.put(bucket, name, buf.getvalue())
+    else:
+        settings.STORAGE_IMPL.put(bucket, name, image_binary)