[ADF-4854] sticky header for task list (#5036)

* sticky header for task list

* fix html

* add docs

* update code docs

lib/process-services-cloud/src/lib/task/task-list/components/task-list-cloud.component.html

@@ -6,6 +6,7 @@
             [loading]="isLoading"
             [multiselect]="multiselect"
             [selectionMode]="selectionMode"
+            [stickyHeader]="stickyHeader"
             (row-select)="onRowSelect($event)"
             (row-unselect)="onRowUnselect($event)"
             (rowClick)="onRowClick($event)"

lib/process-services-cloud/src/lib/task/task-list/components/task-list-cloud.component.ts

@@ -117,6 +117,10 @@ export class TaskListCloudComponent extends DataTableSchema implements OnChanges
     @Input()
     multiselect: boolean = false;
 
+    /** Toggles the sticky header mode. */
+    @Input()
+    stickyHeader: boolean = false;
+
     /**
      * Specifies how the table should be sorted. The parameters are for BE sorting.
      */