chore: import upstream snapshot with attribution

dotnet/samples/Demos/ProcessWithCloudEvents/ProcessWithCloudEvents.Grpc/Extensions/ConfigurationExtension.cs

@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.ComponentModel.DataAnnotations;
+
+namespace ProcessWithCloudEvents.Grpc.Extensions;
+
+/// <summary>
+/// Class with extension methods for app configuration.
+/// </summary>
+public static class ConfigurationExtensions
+{
+    /// <summary>
+    /// Returns <typeparamref name="TOptions"/> if it's valid or throws <see cref="ValidationException"/>.
+    /// </summary>
+    public static TOptions GetValid<TOptions>(this IConfigurationRoot configurationRoot, string sectionName)
+    {
+        var options = configurationRoot.GetSection(sectionName).Get<TOptions>()!;
+
+        Validator.ValidateObject(options, new(options));
+
+        return options;
+    }
+}