Rework metadata struct loading to use new struct versioning

Il2CppInspector.Common/Next/PrimitivePointer.cs

@@ -0,0 +1,60 @@
+using System.Collections.Immutable;
+using VersionedSerialization;
+using VersionedSerialization.Attributes;
+
+namespace Il2CppInspector.Next;
+
+public struct PrimitivePointer<T>(ulong value = 0) : IReadable, IEquatable<PrimitivePointer<T>> where T : unmanaged
+{
+    [NativeInteger]
+    private ulong _value = value;
+
+    public readonly ulong PointerValue => _value;
+    public readonly bool Null => _value == 0;
+
+    public void Read<TReader>(ref TReader reader, in StructVersion version = default) where TReader : IReader, allows ref struct
+    {
+        _value = reader.ReadNUInt();
+    }
+
+    public static int Size(in StructVersion version = default, bool is32Bit = false)
+    {
+        return is32Bit ? 4 : 8;
+    }
+
+    public readonly T Read(ref SpanReader reader)
+    {
+        reader.Offset = (int)PointerValue;
+        return reader.ReadPrimitive<T>();
+    }
+
+    public readonly ImmutableArray<T> ReadArray(ref SpanReader reader, long count)
+    {
+        reader.Offset = (int)PointerValue;
+        return reader.ReadPrimitiveArray<T>(count);
+    }
+
+    public static implicit operator PrimitivePointer<T>(ulong value) => new(value);
+    public static implicit operator ulong(PrimitivePointer<T> ptr) => ptr.PointerValue;
+
+    #region Equality operators + ToString
+
+    public static bool operator ==(PrimitivePointer<T> left, PrimitivePointer<T> right)
+        => left._value == right._value;
+
+    public static bool operator !=(PrimitivePointer<T> left, PrimitivePointer<T> right)
+        => !(left == right);
+
+    public readonly override bool Equals(object? obj)
+        => obj is PrimitivePointer<T> other && Equals(other);
+
+    public readonly bool Equals(PrimitivePointer<T> other)
+        => this == other;
+
+    public readonly override int GetHashCode()
+        => HashCode.Combine(_value);
+
+    public readonly override string ToString() => $"0x{_value:X} <{typeof(T).Name}>";
+
+    #endregion
+}