Add Lazy DI support

StabilityMatrix.Avalonia/App.axaml.cs

@@ -325,6 +325,7 @@ public sealed class App : Application
     {
         var services = new ServiceCollection();
         services.AddMemoryCache();
+        services.AddLazyInstance();
 
         var exportedTypes = AppDomain.CurrentDomain
             .GetAssemblies()

StabilityMatrix.Core/Helper/LazyInstance.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StabilityMatrix.Core.Helper;
+
+/// <summary>
+/// Lazy instance of a DI service.
+/// </summary>
+public class LazyInstance<T> : Lazy<T>
+    where T : notnull
+{
+    public LazyInstance(IServiceProvider serviceProvider)
+        : base(serviceProvider.GetRequiredService<T>) { }
+}
+
+public static class LazyInstanceServiceExtensions
+{
+    /// <summary>
+    /// Register <see cref="LazyInstance{T}"/> to be used when resolving <see cref="Lazy{T}"/> instances.
+    /// </summary>
+    public static IServiceCollection AddLazyInstance(this IServiceCollection services)
+    {
+        services.AddTransient(typeof(Lazy<>), typeof(LazyInstance<>));
+        return services;
+    }
+}