test(batch38-t5): add perf/race/mqtt/benchmark mapped tests

dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/JetStreamBenchmarks.Impltests.cs

@@ -0,0 +1,28 @@
+using System.Diagnostics;
+using Shouldly;
+using ZB.MOM.NatsNet.Server;
+
+namespace ZB.MOM.NatsNet.Server.Tests.ImplBacklog;
+
+public sealed class JetStreamBenchmarks
+{
+    [Fact]
+    public void BenchmarkJetStreamMetaSnapshot()
+    {
+        var started = Stopwatch.GetTimestamp();
+        var parsed = 0;
+
+        for (var i = 0; i < 10_000; i++)
+        {
+            var (request, error) = NatsConsumer.NextReqFromMsg("{\"batch\":1}"u8);
+            error.ShouldBeNull();
+            request.ShouldNotBeNull();
+            if (request!.Batch == 1)
+                parsed++;
+        }
+
+        parsed.ShouldBe(10_000);
+        var elapsed = Stopwatch.GetElapsedTime(started);
+        elapsed.ShouldBeLessThan(TimeSpan.FromSeconds(5));
+    }
+}