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/Attestor/StellaOps.Attestor.Envelope/DsseEnvelopeSerializationOptions.cs

@@ -0,0 +1,14 @@
+namespace StellaOps.Attestor.Envelope;
+
+public sealed class DsseEnvelopeSerializationOptions
+{
+    public bool EmitCompactJson { get; init; } = true;
+
+    public bool EmitExpandedJson { get; init; } = true;
+
+    public bool IndentExpandedJson { get; init; } = true;
+
+    public bool IncludePayloadPreview { get; init; } = true;
+
+    public DsseCompressionAlgorithm CompressionAlgorithm { get; init; } = DsseCompressionAlgorithm.None;
+}