feat(templates): add type hash support and the corresponding testing

Redcraft.Utility/Source/Public/Templates/Variant.h

@@ -2,6 +2,7 @@
 
 #include "CoreTypes.h"
 #include "Templates/Invoke.h"
+#include "Templates/TypeHash.h"
 #include "Templates/Utility.h"
 #include "TypeTraits/TypeTraits.h"
 #include "Miscellaneous/AssertionMacros.h"
@@ -418,6 +419,12 @@ struct TVariant
 		return R(NAMESPACE_PRIVATE::TVariantVisitHelper<R, F, Types...>::VisitConstRValueFuncs[GetIndex()](Forward<F>(Func), &Value));
 	}
 
+	constexpr size_t GetTypeHash() const requires (true && ... && CHashable<Types>)
+	{
+		if (!IsValid()) return NAMESPACE_REDCRAFT::GetTypeHash(nullptr);
+		return Visit([](auto&& A) { return NAMESPACE_REDCRAFT::GetTypeHash(A); });
+	}
+
 	constexpr void Reset()
 	{
 		if (GetIndex() == INDEX_NONE) return;