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/SurfaceValidationOptions.cs

@@ -0,0 +1,18 @@
+namespace StellaOps.Scanner.Surface.Validation;
+
+/// <summary>
+/// Controls behaviour of the surface validation runner.
+/// </summary>
+public sealed class SurfaceValidationOptions
+{
+    /// <summary>
+    /// Gets or sets a value indicating whether the runner should continue invoking validators after an error is recorded.
+    /// </summary>
+    public bool ContinueOnError { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the runner should throw a <see cref="SurfaceValidationException"/> when validation fails.
+    /// Defaults to <c>true</c> to align with fail-fast expectations.
+    /// </summary>
+    public bool ThrowOnFailure { get; set; } = true;
+}