getHDF5Type

Gets the HDF5 datatype for a D type.

For native types (int, double, etc.), returns the pre-defined HDF5 native type. For string types (char[N]), creates a new fixed-length string type that must be closed with H5Tclose after use. For variable-length strings (string), creates a variable-length string type. For binary arrays (ubyte[N]), creates an array type.