Hierarchy v2 sample

Including
- CDS OData V2 Adapter Proxy
- OData V2
- Fiori Elements V2
- SAPUI5
- List Report (type `TreeTable`)
- `@sap.hierarchy` annotations

fiori/app/genres/fiori-service.cds

@@ -0,0 +1,21 @@
+namespace sap.capire.bookshop;
+
+using { sap.capire.bookshop } from '@capire/bookstore/srv/mashup';
+
+entity GenreHierarchy : bookshop.Genres {
+  hierarchyLevel : Integer default 0;
+  drillState     : String default 'leaf';
+  parent         : Association to GenreHierarchy;
+  children       : Composition of many GenreHierarchy on children.parent = $self;
+}
+
+annotate bookshop.GenreHierarchy {
+  ID             @sap.hierarchy.node.for;
+  parent         @sap.hierarchy.parent.node.for;
+  hierarchyLevel @sap.hierarchy.level.for;
+  drillState     @sap.hierarchy.drill.state.for;
+}
+
+extend service CatalogService with {
+  @readonly entity GenreHierarchy as projection on bookshop.GenreHierarchy;
+}