Add new GetScope() overload (#85)

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: viceroypenguin

src/Immediate.Cache.Shared/ApplicationCacheBase.cs

@@ -195,11 +195,11 @@ private async Task RunHandler(CancellationTokenSource tokenSource)
 				try
 				{
 					var token = tokenSource.Token;
-					var scope = handler.GetScope();
+					var scope = handler.GetScope(out var service);
 
 					await using (scope.ConfigureAwait(false))
 					{
-						var response = await scope.Service
+						var response = await service
 							.HandleAsync(
 								request,
 								token

src/Immediate.Cache.Shared/Owned.cs

@@ -22,12 +22,30 @@ IServiceScopeFactory serviceScopeFactory
 	///	    An <see cref="OwnedScope{T}"/> containing both the scope and the service, so that the scope can be disposed
 	///     at the appropriate time.
 	/// </returns>
-	public OwnedScope<T> GetScope()
+	public OwnedScope<T> GetScope() => GetScope(out _);
+
+	/// <summary>
+	///	    Creates a temporary scope and gets an instance of the service from that scope.
+	/// </summary>
+	/// <param name="service">
+	///		The instance of the service created from the scope.
+	/// </param>
+	/// <returns>
+	///	    An <see cref="OwnedScope{T}"/> containing both the scope and the service, so that the scope can be disposed
+	///     at the appropriate time.
+	/// </returns>
+	public OwnedScope<T> GetScope(out T service)
 	{
 		var scope = serviceScopeFactory.CreateAsyncScope();
-		return new(
-			scope.ServiceProvider.GetRequiredService<T>(),
-			scope
-		);
+		try
+		{
+			service = scope.ServiceProvider.GetRequiredService<T>();
+			return new(service, scope);
+		}
+		catch
+		{
+			scope.Dispose();
+			throw;
+		}
 	}
 }