Reduce hot-path allocations in message processing pipeline

src/Wolverine/Runtime/Handlers/Executor.cs

@@ -191,7 +191,7 @@ public async Task<IContinuation> ExecuteAsync(MessageContext context, Cancellati
 
             _tracker.ExecutionFinished(envelope);
 
-            return new MessageSucceededContinuation(_tracker);
+            return MessageSucceededContinuation.Instance;
         }
         catch (Exception e)
         {

src/Wolverine/Runtime/MessageContext.cs

@@ -69,7 +69,21 @@ private bool hasRequestedReply()
 
     private bool isMissingRequestedReply()
     {
-        return Outstanding.Concat(_sent ?? []).All(x => x.MessageType != Envelope!.ReplyRequested);
+        var replyRequested = Envelope!.ReplyRequested;
+        foreach (var envelope in Outstanding)
+        {
+            if (envelope.MessageType == replyRequested) return false;
+        }
+
+        if (_sent != null)
+        {
+            foreach (var envelope in _sent)
+            {
+                if (envelope.MessageType == replyRequested) return false;
+            }
+        }
+
+        return true;
     }
 
     /// <summary>

src/Wolverine/Runtime/MessageSucceededContinuation.cs

@@ -9,17 +9,10 @@ public class MessageSucceededContinuation : IContinuation
 {
     public static readonly MessageSucceededContinuation Instance = new();
 
-    private IMessageTracker? _tracker;
-
     private MessageSucceededContinuation()
     {
     }
 
-    public MessageSucceededContinuation(IMessageTracker tracker)
-    {
-        _tracker = tracker;
-    }
-
     public async ValueTask ExecuteAsync(IEnvelopeLifecycle lifecycle,
         IWolverineRuntime runtime,
         DateTimeOffset now, Activity? activity)
@@ -30,7 +23,7 @@ public async ValueTask ExecuteAsync(IEnvelopeLifecycle lifecycle,
 
             await lifecycle.CompleteAsync();
 
-            (_tracker ?? runtime.MessageTracking).MessageSucceeded(lifecycle.Envelope!);
+            runtime.MessageTracking.MessageSucceeded(lifecycle.Envelope!);
         }
         catch (Exception ex)
         {