Feat: mcp server (#7084)

### What problem does this PR solve?

Add MCP support with a client example.

Issue link: #4344

### Type of change

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

mcp/client/client.py

@@ -0,0 +1,42 @@
+#
+#  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 mcp.client.session import ClientSession
+from mcp.client.sse import sse_client
+
+
+async def main():
+    try:
+        async with sse_client("http://localhost:9382/sse", headers={"api_key": "ragflow-IyMGI1ZDhjMTA2ZTExZjBiYTMyMGQ4Zm"}) as streams:
+            async with ClientSession(
+                streams[0],
+                streams[1],
+            ) as session:
+                await session.initialize()
+                tools = await session.list_tools()
+                print(f"{tools.tools=}")
+                response = await session.call_tool(name="ragflow_retrival", arguments={"dataset_ids": ["ce3bb17cf27a11efa69751e139332ced"], "document_ids": [], "question": "How to install neovim?"})
+                print(f"Tool response: {response.model_dump()}")
+
+    except Exception as e:
+        print(e)
+
+
+if __name__ == "__main__":
+    from anyio import run
+
+    run(main)