default String getStructureNamespace() throws IOException {
		return null;
	}
Returns the namespace that any labels should be placed in.

@return name of namespace to place the label for this structure mapped type, or null
@throws IOException if error generating namespace name
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/golang/structmapping/StructureMarkup.java