feat(batch27): implement jetstream bootstrap and account wiring

dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.cs

@@ -253,6 +253,7 @@ public sealed partial class NatsServer : INatsServer
     private          long            _cproto;                     // count of INFO-capable clients
     private readonly ConcurrentDictionary<string, object?> _nodeToInfo = new(StringComparer.Ordinal);
     private readonly ConcurrentDictionary<string, object?> _raftNodes  = new(StringComparer.Ordinal);
+    private          JetStream?            _jetStream;
     private readonly Dictionary<string, string>  _routesToSelf          = [];
     private          INetResolver?               _routeResolver;
     private readonly ConcurrentDictionary<string, object?> _rateLimitLogging = new();