using virtual fuction instead of reflection (#11513)

###Part of #11160
Building on top of Eric's IPC pr - his work allowed for other
bottlenecks to reveal themselves.

### Context

![read_from_stream_reflection](https://github.com/user-attachments/assets/aa0bd4b9-cb39-4351-9c51-e4bbbfa01c37)

![read_from_stream_virtual](https://github.com/user-attachments/assets/7fe81c55-1aaf-4e79-97a5-648c6a68cfe5)
Currently, the ReadFromStream function uses 
```
ArgsReaderDelegate readerMethod = (ArgsReaderDelegate)CreateDelegateRobust(typeof(ArgsReaderDelegate), _buildEvent, methodInfo);
```
for a large portion of it's packet deserialization. This is large enough
to be seen in the performance profiler as shown above more than 3% of
CPU an it's on a critical path.
When I checked, the function was already virtual so the change is
minimal. Unfortunately I had to make an allowance to the task host since
it wasn't compatible.

### Changes Made
Exposed a convenience public endpoint for the CreateFromStream function,
that calls the virtual method Create from stream.
Used this endpoint instead of delegate creation.

### Testing
As long as nothing breaks, I consider that a win.
I did local profiling.

Author: SimaTian

src/Framework/BuildEventArgs.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;

src/Shared/LogMessagePacketBase.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
@@ -270,11 +270,12 @@ internal abstract class LogMessagePacketBase : INodePacket
         /// </summary>
         private static readonly int s_defaultPacketVersion = (Environment.Version.Major * 10) + Environment.Version.Minor;
 
+#if TASKHOST
         /// <summary>
         /// Dictionary of methods used to read BuildEventArgs.
         /// </summary>
         private static Dictionary<LoggingEventType, MethodInfo> s_readMethodCache = new Dictionary<LoggingEventType, MethodInfo>();
-
+#endif
         /// <summary>
         /// Dictionary of methods used to write BuildEventArgs.
         /// </summary>
@@ -478,6 +479,8 @@ internal void ReadFromStream(ITranslator translator)
 
             if (eventCanSerializeItself)
             {
+
+#if TASKHOST
                 MethodInfo methodInfo = null;
                 lock (s_readMethodCache)
                 {
@@ -492,6 +495,11 @@ internal void ReadFromStream(ITranslator translator)
                 ArgsReaderDelegate readerMethod = (ArgsReaderDelegate)CreateDelegateRobust(typeof(ArgsReaderDelegate), _buildEvent, methodInfo);
 
                 readerMethod(translator.Reader, packetVersion);
+
+#else
+                _buildEvent.CreateFromStream(translator.Reader, packetVersion);
+#endif
+
                 if (_eventType == LoggingEventType.TargetFinishedEvent && _targetFinishedTranslator != null)
                 {
                     _targetFinishedTranslator(translator, (TargetFinishedEventArgs)_buildEvent);