Update [ICommand] generator for Task<T> returns

Author: Sergio0694

CommunityToolkit.Mvvm.SourceGenerators/Input/ICommandGenerator.Execute.cs

@@ -309,8 +309,9 @@ public static (string FieldName, string PropertyName) GetGeneratedFieldAndProper
         {
             string propertyName = methodSymbol.Name;
 
-            if (methodSymbol.ReturnType.HasFullyQualifiedName("global::System.Threading.Tasks.Task") &&
-                methodSymbol.Name.EndsWith("Async"))
+            if (methodSymbol.Name.EndsWith("Async") &&
+                (methodSymbol.ReturnType.HasFullyQualifiedName("global::System.Threading.Tasks.Task") ||
+                 methodSymbol.ReturnType.InheritsFromFullyQualifiedName("global::System.Threading.Tasks.Task")))
             {
                 propertyName = propertyName.Substring(0, propertyName.Length - "Async".Length);
             }
@@ -372,7 +373,9 @@ private static bool TryMapCommandTypesFromMethod(
                 return true;
             }
 
-            if (methodSymbol.ReturnType.HasFullyQualifiedName("global::System.Threading.Tasks.Task"))
+            // Map all Task-returning methods
+            if (methodSymbol.ReturnType.HasFullyQualifiedName("global::System.Threading.Tasks.Task") ||
+                methodSymbol.ReturnType.InheritsFromFullyQualifiedName("global::System.Threading.Tasks.Task"))
             {
                 // Map <void, Task> to IAsyncRelayCommand, AsyncRelayCommand, Func<Task>
                 if (methodSymbol.Parameters.Length == 0)

CommunityToolkit.Mvvm/Input/Attributes/ICommandAttribute.cs

@@ -51,11 +51,15 @@ namespace CommunityToolkit.Mvvm.Input;
 /// <code>
 /// Task Method();
 /// Task Method(CancellationToken);
+/// Task&lt;T&gt; Method();
+/// Task&lt;T&gt; Method(CancellationToken);
 /// </code>
 /// Will both generate an <see cref="IAsyncRelayCommand"/> property (using an <see cref="AsyncRelayCommand{T}"/> instance).
 /// <code>
 /// Task Method(T?);
 /// Task Method(T?, CancellationToken);
+/// Task&lt;T&gt; Method(T?);
+/// Task&lt;T&gt; Method(T?, CancellationToken);
 /// </code>
 /// Will both generate an <see cref="IAsyncRelayCommand{T}"/> property (using an <see cref="AsyncRelayCommand{T}"/> instance).
 /// </para>