chore: import upstream snapshot with attribution

swig/ChunkedArray_API_extensions.i

@@ -0,0 +1,28 @@
+/*!
+ * Copyright (c) 2021-2026 Microsoft Corporation. All rights reserved.
+ * Copyright (c) 2021-2026 The LightGBM developers. All rights reserved.
+ * Licensed under the MIT License. See LICENSE file in the project root for license information.
+ */
+/**
+ * Wrap chunked_array.hpp class for SWIG usage.
+ *
+ * Author: Alberto Ferreira
+ */
+
+%{
+#include "../include/LightGBM/utils/chunked_array.hpp"
+%}
+
+%include "../include/LightGBM/utils/chunked_array.hpp"
+
+using LightGBM::ChunkedArray;
+
+%template(int32ChunkedArray) ChunkedArray<int32_t>;
+/* Unfortunately, for the time being,
+ * SWIG has issues generating the overloads to coalesce_to()
+ * for larger integral types
+ * so we won't support that for now:
+ */
+//%template(int64ChunkedArray) ChunkedArray<int64_t>;
+%template(floatChunkedArray) ChunkedArray<float>;
+%template(doubleChunkedArray) ChunkedArray<double>;