public StructureViewBuilder getStructureViewBuilder(PsiFile psiFile) {
        return new TreeBasedStructureViewBuilder() {
            @Override
            public StructureViewModel createStructureViewModel(Editor editor) {
                return new SdStructureViewModel(psiFile);
            }
        };
    }
This class is used for the extension (in plugin.xml) to the class SdStructureViewModel. It make the IDE use our 
plugin's code when creating the "Structure View" window.

@author Shahar Ariel
integration/intellij/src/main/java/ai/vespa/intellij/schema/structure/SdStructureViewFactory.java