chore: import upstream snapshot with attribution

plugin/scatterElementsPlugin/scatterElementsCommon.h

@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+
+#ifndef SCATTER_ELEMENTS_COMMON_H
+#define SCATTER_ELEMENTS_COMMON_H
+
+#include <map>
+#include <memory>
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+#include "common/plugin.h"
+
+enum class ReductionType : int32_t
+{
+    kSUM,
+    kMUL,
+    kMEAN,
+    kMIN,
+    kMAX
+};
+
+extern std::unordered_map<std::string, ReductionType> const kREDUCE_STR_TO_ENUM;
+extern std::unordered_map<ReductionType, std::string> const kREDUCE_ENUM_TO_STR;
+
+#endif // SCATTER_ELEMENTS_COMMON_H