refactor(AuthClient): Enhance AuthClient with lazy initialization and connection error handling

- Replaced immediate connection start with lazy initialization via Lazy<Task<bool>>.
- Added IsConnected and ConnectionError properties to track connection status and errors.
- Introduced TryStartAsync method to safely attempt connection startup without throwing exceptions.

DigitalData.Auth.Abstractions/IAuthClient.cs

@@ -3,4 +3,6 @@
 public interface IAuthClient : IAuthClientHandler
 {
     Task StartAsync();
+
+    Task<bool> TryStartAsync();
 }