Rework metadata struct loading to use new struct versioning

Il2CppInspector.Common/Next/BinaryMetadata/Il2CppGenericInst.cs

@@ -3,11 +3,11 @@
 namespace Il2CppInspector.Next.BinaryMetadata;
 
 [VersionedStruct]
-public partial struct Il2CppGenericInst
+public partial record struct Il2CppGenericInst
 {
     public readonly bool Valid => TypeArgc > 0;
 
-    [Aligned(0)]
+    [NativeInteger]
     public uint TypeArgc;
 
     public Pointer<Pointer<Il2CppType>> TypeArgv;