[ADF-2131] Search sorting (#3334)

* sorting configuration

* detect primary sorting and use with document list

* search results sorting

* docs update

* unit tests and code updates

* update code

* update code

* generic sorting picker, test updates

* ability to switch off client side sorting

* update docs for document list

demo-shell/src/app/components/files/files.component.ts

@@ -74,6 +74,24 @@ export class FilesComponent implements OnInit, OnChanges, OnDestroy {
 
     processId;
 
+    @Input()
+    sorting = ['name', 'asc'];
+
+    @Input()
+    sortingMode = 'client';
+
+    @Input()
+    showRecentFiles = true;
+
+    @Input()
+    showSitePicker = true;
+
+    @Input()
+    showSettingsPanel = true;
+
+    @Input()
+    showHeader = true;
+
     @Input()
     selectionMode = 'multiple';