add support for metadata

Il2CppInspector.Common/Next/Metadata/Il2CppStringLiteral.cs

@@ -6,6 +6,7 @@ using StringLiteralIndex = int;
 [VersionedStruct]
 public partial record struct Il2CppStringLiteral
 {
+    [VersionCondition(LessThan = "31.0")]
     public uint Length { get; private set; }
     public StringLiteralIndex DataIndex { get; private set; }
 }