Add Authority Advisory AI and API Lifecycle Configuration

- Introduced AuthorityAdvisoryAiOptions and related classes for managing advisory AI configurations, including remote inference options and tenant-specific settings.
- Added AuthorityApiLifecycleOptions to control API lifecycle settings, including legacy OAuth endpoint configurations.
- Implemented validation and normalization methods for both advisory AI and API lifecycle options to ensure proper configuration.
- Created AuthorityNotificationsOptions and its related classes for managing notification settings, including ack tokens, webhooks, and escalation options.
- Developed IssuerDirectoryClient and related models for interacting with the issuer directory service, including caching mechanisms and HTTP client configurations.
- Added support for dependency injection through ServiceCollectionExtensions for the Issuer Directory Client.
- Updated project file to include necessary package references for the new Issuer Directory Client library.

src/Scanner/__Libraries/StellaOps.Scanner.Surface.Validation/SurfaceValidationBuilder.cs

@@ -0,0 +1,33 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StellaOps.Scanner.Surface.Validation;
+
+public sealed class SurfaceValidationBuilder
+{
+    private readonly IServiceCollection _services;
+
+    internal SurfaceValidationBuilder(IServiceCollection services)
+    {
+        _services = services;
+    }
+
+    public SurfaceValidationBuilder AddValidator<TValidator>()
+        where TValidator : class, ISurfaceValidator
+    {
+        _services.AddSingleton<ISurfaceValidator, TValidator>();
+        return this;
+    }
+
+    public SurfaceValidationBuilder AddValidator(Func<IServiceProvider, ISurfaceValidator> factory)
+    {
+        if (factory is null)
+        {
+            throw new ArgumentNullException(nameof(factory));
+        }
+
+        _services.AddSingleton(provider => factory(provider));
+        return this;
+    }
+
+}