add io_process_plugin for sparse embedding (#34214)

Signed-off-by: augusto.yjh <augusto.yjh@antgroup.com>
Signed-off-by: Augusto Yao <augusto.yjh@antgroup.com>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

tests/plugins/bge_m3_sparse_plugin/setup.py

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from setuptools import setup
+
+setup(
+    name="bge-m3-sparse-plugin",
+    version="0.1",
+    packages=["bge_m3_sparse_processor"],
+    entry_points={
+        "vllm.io_processor_plugins": [
+            "bge_m3_sparse_plugin = bge_m3_sparse_processor:register_bge_m3_sparse_embeddings_processor",  # noqa: E501
+        ]
+    },
+)