chore: import upstream snapshot with attribution

dotnet/samples/Demos/VectorStoreRAG/IDataLoader.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace VectorStoreRAG;
+
+/// <summary>
+/// Interface for loading data into a data store.
+/// </summary>
+internal interface IDataLoader
+{
+    /// <summary>
+    /// Load the text from a PDF file into the data store.
+    /// </summary>
+    /// <param name="pdfPath">The pdf file to load.</param>
+    /// <param name="batchSize">Maximum number of parallel threads to generate embeddings and upload records.</param>
+    /// <param name="betweenBatchDelayInMs">The number of milliseconds to delay between batches to avoid throttling.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests.</param>
+    /// <returns>An async task that completes when the loading is complete.</returns>
+    Task LoadPdf(string pdfPath, int batchSize, int betweenBatchDelayInMs, CancellationToken cancellationToken);
+}