fix: Optimizes TextDefinition to eliminate allocations. Removes TextDefinition ctor. (#1221)

### BREAKING CHANGE ###
The constructor for `TextDefinition` has been removed. Instead use `TextDefinition.Of()` or cast the integer/string to TextDefinition.

Projects/Server/Serialization/IGenericReader.cs

@@ -124,9 +124,9 @@ public interface IGenericReader
     {
         return ReadEncodedInt() switch
         {
-            0 => new TextDefinition(),
-            1 => new TextDefinition(ReadEncodedInt()),
-            2 => new TextDefinition(ReadString()),
+            0 => TextDefinition.Empty,
+            1 => ReadEncodedInt(),
+            2 => ReadString(),
             _ => null
         };
     }