Eliminate enum boxing allocations from Kestrel HTTP2 logging (#19277)

Author: JamesNK

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs

@@ -272,12 +272,18 @@ public virtual void HPackEncodingError(string connectionId, int streamId, HPackE
 
         public void Http2FrameReceived(string connectionId, Http2Frame frame)
         {
-            _http2FrameReceived(_logger, connectionId, frame.Type, frame.StreamId, frame.PayloadLength, frame.ShowFlags(), null);
+            if (_logger.IsEnabled(LogLevel.Trace))
+            {
+                _http2FrameReceived(_logger, connectionId, frame.Type, frame.StreamId, frame.PayloadLength, frame.ShowFlags(), null);
+            }
         }
 
         public void Http2FrameSending(string connectionId, Http2Frame frame)
         {
-            _http2FrameSending(_logger, connectionId, frame.Type, frame.StreamId, frame.PayloadLength, frame.ShowFlags(), null);
+            if (_logger.IsEnabled(LogLevel.Trace))
+            {
+                _http2FrameSending(_logger, connectionId, frame.Type, frame.StreamId, frame.PayloadLength, frame.ShowFlags(), null);
+            }
         }
 
         public virtual void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)