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.Policy/PolicyBinder.cs

@@ -122,6 +122,8 @@ public static class PolicyBinder
         {
             case null:
                 return null;
+            case string s when bool.TryParse(s, out var boolValue):
+                return JsonValue.Create(boolValue);
             case string s:
                 return JsonValue.Create(s);
             case bool b: