Refactor: Split CustomData attribute and newer attribute headers

Avoid including DNA_customdata_types.h everywhere we include the
attributes header. Over time the older attribute header should be
used less and less.

Part of #122398

Pull Request: https://projects.blender.org/blender/blender/pulls/147980

intern/cycles/blender/mesh.cpp

@@ -25,6 +25,7 @@
 #include "util/math.h"
 
 #include "BKE_anonymous_attribute_id.hh"
+#include "BKE_attribute.h"
 #include "BKE_attribute.hh"
 #include "BKE_attribute_math.hh"
 #include "BKE_customdata.hh"