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.

etc/notify.yaml.sample

@@ -15,10 +15,11 @@ authority:
   allowAnonymousFallback: false
   backchannelTimeoutSeconds: 30
   tokenClockSkewSeconds: 60
-  audiences:
-    - notify
-  readScope: notify.read
-  adminScope: notify.admin
+  audiences:
+    - notify
+  viewerScope: notify.viewer
+  operatorScope: notify.operator
+  adminScope: notify.admin
 
 api:
   basePath: "/api/v1/notify"