[SofaKernel] Use new conditions to select copy-on-write

Instead of relying on DataTypeInfo to detect if we should use copy-on-write
mechanisme use standard c++ type traits to do so.

NB: I'm not sure it make sense to handle a copy-on-write and non
copy-on-write. Because using Data is actually already a slow mechanisme...
so selecting between copy or non-copy mode is overkill. Forcing copy on write
to true has also zero noticeable performance cost on the caducesus.
So why not removig it.

SofaKernel/modules/SofaCore/src/sofa/core/objectmodel/Data.h

@@ -253,10 +253,10 @@ class Data : public BaseData
     bool copyValueFrom(const BaseData* data){ return doCopyValueFrom(data); }
     bool copyValueFrom(const Data<T>* data);
 
-    bool isCopyOnWrite(){ return sofa::defaulttype::DataTypeInfo<T>::CopyOnWrite; }
+    constexpr bool isCopyOnWrite(){ return std::is_scalar_v<T> || std::is_pointer_v<T>; }
 
 protected:
-    typedef DataContentValue<T, sofa::defaulttype::DataTypeInfo<T>::CopyOnWrite> ValueType;
+    typedef DataContentValue<T, std::is_scalar_v<T> || std::is_pointer_v<T>> ValueType;
 
     /// Value
     ValueType m_value;