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.EntryTrace/EntryTraceCacheSerializer.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Text.Json;
+
+namespace StellaOps.Scanner.EntryTrace;
+
+internal static class EntryTraceCacheSerializer
+{
+    public const string CurrentVersion = "entrytrace.v1";
+
+    public static byte[] Serialize(EntryTraceCacheEnvelope envelope)
+    {
+        if (envelope is null)
+        {
+            throw new ArgumentNullException(nameof(envelope));
+        }
+
+        return JsonSerializer.SerializeToUtf8Bytes(envelope);
+    }
+
+    public static EntryTraceCacheEnvelope Deserialize(byte[] payload)
+    {
+        if (payload is null || payload.Length == 0)
+        {
+            throw new ArgumentException("Payload cannot be empty.", nameof(payload));
+        }
+
+        var envelope = JsonSerializer.Deserialize<EntryTraceCacheEnvelope>(payload);
+        if (envelope is null)
+        {
+            throw new InvalidOperationException("Failed to deserialize entry trace cache envelope.");
+        }
+
+        return envelope;
+    }
+}