The `node_storage` functions to retrieve const and mutable structs from a node are generated by a short macro that can be placed at the top of each relevant file. I use this in D8286 to make code snippets in the socket declarations much shorter, but I thought it would be good to use it consistently everywhere else too. The functions are also useful to avoid copy and paste errors, like the one corrected in the cylinder node in this commit. Differential Revision: https://developer.blender.org/D13491