[ADF-2128] facet container component (#3094)

* (wip) facet container

* shaping out the API

* code lint fixes

* radiobox facet example

* fields selector facet

* search limits support

* scope locations facet example

* move custom search to 'search.query' config

* use facet fields and queries from the config file

* use facet filters

* use facet buckets in query

* preserve expanded/checked states

* code cleanup and binding fixes

* fix apis after rebase

* extract query builder into separate class

* code improvements

* full chip list (merge facet fields with queries)

* placeholder for range requests

* move search infrastructure to ADF core

* cleanup code

* auto-search on init

* move search components to the content services

* selected facets chip list

* split into separate components at ADF level

* move the rest of the implementation to ADF

* facet builder fixes and tests

* translation support for category names

* docs placeholders

* update language level

* unit tests and packaging updates

* fix after rebase

* remove fdescribe

* some docs on search settings

* rename components as per review

* simplify chip list as per review

* turn query builder into service

* improve search service, integrate old search results

* fix node selector integration

* move service to the top module

* update tests

* remove fdescribe

* update tests

* test fixes

* test fixes

* test updates

* fix tests

* code and test fixes

* remove fit

* fix tests

* fix tests

* remove obsolete test

* increase bundle threshold

* update docs to reflect PR changes

* fix docs

lib/core/services/settings.service.spec.ts

@@ -16,10 +16,8 @@
  */
 
 import { async, TestBed } from '@angular/core/testing';
-import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
 import { SettingsService } from './settings.service';
 import { AppConfigModule } from '../app-config/app-config.module';
-import { TranslateLoaderService } from './translate-loader.service';
 
 describe('SettingsService', () => {
 
@@ -28,13 +26,7 @@ describe('SettingsService', () => {
     beforeEach(async(() => {
         TestBed.configureTestingModule({
             imports: [
-                AppConfigModule,
-                TranslateModule.forRoot({
-                    loader: {
-                        provide: TranslateLoader,
-                        useClass: TranslateLoaderService
-                    }
-                })
+                AppConfigModule
             ],
             providers: [
                 SettingsService