Test: add sdk Dataset test cases (#8077)

### What problem does this PR solve?

Add sdk dataset test cases

### Type of change

- [x] Add test case

test/testcases/test_sdk_api/common.py

@@ -0,0 +1,23 @@
+#
+#  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.
+#
+
+# DATASET MANAGEMENT
+def batch_create_datasets(client, num):
+    datasets = []
+    for i in range(num):
+        dataset = client.create_dataset(name=f"dataset_{i}")
+        datasets.append(dataset)
+    return datasets