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.Env/SurfaceEnvironmentException.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace StellaOps.Scanner.Surface.Env;
+
+public sealed class SurfaceEnvironmentException : Exception
+{
+    public SurfaceEnvironmentException(string message, string variable)
+        : base(message)
+    {
+        Variable = variable;
+    }
+
+    public SurfaceEnvironmentException(string message, string variable, Exception innerException)
+        : base(message, innerException)
+    {
+        Variable = variable;
+    }
+
+    public string Variable { get; }
+}