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/Policy/__Tests/StellaOps.Policy.Gateway.Tests/GatewayActivationTests.cs

@@ -435,7 +435,7 @@ public sealed class GatewayActivationTests
                 app.Use(async (context, innerNext) =>
                 {
                     context.Connection.RemoteIpAddress ??= IPAddress.Loopback;
-                    await innerNext().ConfigureAwait(false);
+                    await innerNext();
                 });
 
                 next(app);