feat: Initialize Zastava Webhook service with TLS and Authority authentication

- Added Program.cs to set up the web application with Serilog for logging, health check endpoints, and a placeholder admission endpoint.
- Configured Kestrel server to use TLS 1.3 and handle client certificates appropriately.
- Created StellaOps.Zastava.Webhook.csproj with necessary dependencies including Serilog and Polly.
- Documented tasks in TASKS.md for the Zastava Webhook project, outlining current work and exit criteria for each task.

src/StellaOps.Excititor.Connectors.Abstractions/VexConnectorBase.cs

@@ -23,7 +23,7 @@ public abstract class VexConnectorBase : IVexConnector
     /// <inheritdoc />
     public VexProviderKind Kind => Descriptor.Kind;
 
-    protected VexConnectorDescriptor Descriptor { get; }
+    public VexConnectorDescriptor Descriptor { get; }
 
     protected ILogger Logger { get; }