feat(gateway): add MxGateway:Tls options block

src/ZB.MOM.WW.MxGateway.Server/Configuration/GatewayOptions.cs

@@ -43,4 +43,7 @@ public sealed class GatewayOptions
     /// behaviour (alarms disabled).
     /// </summary>
     public AlarmsOptions Alarms { get; init; } = new();
+
+    /// <summary>Gets self-signed TLS certificate auto-generation options.</summary>
+    public TlsOptions Tls { get; init; } = new();
 }