perf: switch typeSb to use ValueStringBuilder

Author: TimothyMakkison

TUnit.Engine/Helpers/ValueListBuilder.cs TUnit.Core/Helpers/ValueListBuilder.csTUnit.Engine/Helpers/ValueListBuilder.cs renamed to TUnit.Core/Helpers/ValueListBuilder.cs

@@ -2,7 +2,7 @@
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
 
-namespace TUnit.Engine.Helpers;
+namespace TUnit.Core.Helpers;
 
 // From https://github.com/dotnet/runtime/blob/d968dc4bbdc0c26876c2cdaadf42740e891586b9/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ValueListBuilder.cs#L8
 internal ref partial struct ValueListBuilder<T>

TUnit.Core/Helpers/ValueStringBuilder.cs

@@ -148,12 +148,12 @@ public void Append(char c)
 
     public void Append(int value) => AppendSpanFormattable(value);
 
-    #if NET8_0_OR_GREATER
+#if NET8_0_OR_GREATER
     private void AppendSpanFormattable<T>(T value) where T : ISpanFormattable
     {
         Debug.Assert(typeof(T).Assembly.Equals(typeof(object).Assembly), "Implementation trusts the results of TryFormat because T is expected to be something known");
 
-        if (value.TryFormat(_chars, out int charsWritten, format: default, provider: null))
+        if (value.TryFormat(_chars[_pos..], out int charsWritten, format: default, provider: null))
         {
             _pos += charsWritten;
             return;