[ADF-3677] Add highlight configuration to SearchQueryBuilder (#4358)

* [ADF-3677] Add highlight configuration to SearchQueryBuilder

* highlight property in search

* Update files.component.ts

* remove comma

* highlight missspell

* fix schhema json highilight

* fix test

* fix lint

* fix lint

* fix lint

* fix search sorting tests

* fix search sorting

* fix lint

* remove useless test

* check for null nodes

* remove duplicated test

* lint

* fix sorting tests

* remove test not search component related

lib/content-services/search/search-configuration.interface.ts

@@ -20,11 +20,12 @@ import { FacetQuery } from './facet-query.interface';
 import { FacetField } from './facet-field.interface';
 import { SearchCategory } from './search-category.interface';
 import { SearchSortingDefinition } from './search-sorting-definition.interface';
+import { RequestHighlight } from '@alfresco/js-api';
 
 export interface SearchConfiguration {
     include?: string[];
     fields?: string[];
-    categories: SearchCategory[];
+    categories?: SearchCategory[];
     filterQueries?: FilterQuery[];
     filterWithContains?: boolean;
     resetButton?: boolean;
@@ -47,4 +48,5 @@ export interface SearchConfiguration {
         options: SearchSortingDefinition[];
         defaults: SearchSortingDefinition[];
     };
+    highlight?: RequestHighlight;
 }