[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

docs/content-services/search-chip-list.component.md

@@ -0,0 +1,13 @@
+---
+Added: v2.3.0
+Status: Active
+---
+
+# Search Chip List Component
+
+```html
+<adf-search-chip-list [searchFilter]="searchFilter"></adf-search-chip-list>
+<adf-search-filter #searchFilter></adf-search-filter>
+```
+
+![Selected Facets](../docassets/images/selected-facets.png)

docs/content-services/search-filter.component.md

@@ -0,0 +1,154 @@
+---
+Added: v2.3.0
+Status: Active
+---
+
+# Search Settings Component
+
+Represents a main container component for custom search and faceted search settings.
+
+## Usage example
+
+```html
+<adf-search-filter #settings></adf-search-filter>
+```
+
+The component is based on dynamically created Widgets to modify the resulting query and options,
+and the `Query Builder` to build and execute the search queries.
+
+## Query Builder Service
+
+Stores information from all the custom search and faceted search widgets,
+compiles and runs the final Search query.
+
+The Query Builder is UI agnostic and does not rely on Angular components.
+It is possible to reuse it with multiple component implementations.
+
+Allows custom widgets to populate and edit the following parts of the resulting query:
+
+- categories
+- query fragments that form query expression
+- include fields
+- scope settings
+- filter queries
+- facet fields
+- range queries
+
+```ts
+constructor(queryBuilder: QueryBuilderService) {
+
+    queryBuilder.updated.subscribe(query => {
+        this.queryBuilder.execute();
+    });
+
+    queryBuilder.executed.subscribe(data => {
+        this.onDataLoaded(data);
+    });
+
+}
+```
+
+## Configuration
+
+The configuration should be provided via the `search` entry in the `app.config.json` file.
+
+Below is an example configuration:
+
+```json
+{
+    "search": {
+        "limits": {
+            "permissionEvaluationTime": null,
+            "permissionEvaluationCount": null
+        },
+        "filterQueries": [
+            { "query": "TYPE:'cm:folder' OR TYPE:'cm:content'" },
+            { "query": "NOT cm:creator:System" }
+        ],
+        "facetFields": {
+            "facets": [
+            { "field": "content.mimetype", "mincount": 1, "label": "Type" },
+            { "field": "content.size", "mincount": 1, "label": "Size" },
+            { "field": "creator", "mincount": 1, "label": "Creator" },
+            { "field": "modifier", "mincount": 1, "label": "Modifier" }
+            ]
+        },
+        "facetQueries": [
+            { "query": "created:2018", "label": "Created This Year" },
+            { "query": "content.mimetype", "label": "Type" },
+            { "query": "content.size:[0 TO 10240]", "label": "Size: xtra small"},
+            { "query": "content.size:[10240 TO 102400]", "label": "Size: small"},
+            { "query": "content.size:[102400 TO 1048576]", "label": "Size: medium" },
+            { "query": "content.size:[1048576 TO 16777216]", "label": "Size: large" },
+            { "query": "content.size:[16777216 TO 134217728]", "label": "Size: xtra large" },
+            { "query": "content.size:[134217728 TO MAX]", "label": "Size: XX large" }
+        ],
+        "query": {
+            "categories": [
+                {
+                    "id": "queryName",
+                    "name": "Name",
+                    "enabled": true,
+                    "expanded": true,
+                    "component": {
+                        "selector": "adf-search-text",
+                        "settings": {
+                            "pattern": "cm:name:'(.*?)'",
+                            "field": "cm:name",
+                            "placeholder": "Enter the name"
+                        }
+                    }
+                }
+            ]
+        }
+    }
+}
+```
+
+## Categories
+
+The Search Settings component and Query Builder require `categories` section provided within the configuration.
+
+Categories are needed to build Widgets so that users can modify the search query at runtime. Every Category can be represented by a single Angular component, either simple or composite one.
+
+```ts
+export interface SearchCategory {
+    id: string;
+    name: string;
+    enabled: boolean;
+    expanded: boolean;
+    component: {
+        selector: string;
+        settings: SearchWidgetSettings;
+    };
+}
+```
+
+The interface above also describes entries in the `search.query.categories` section for the `app.config.json`.
+
+![Search Categories](../docassets/images/search-categories-01.png)
+
+### Properties
+
+For the property types please refer to the `SearchCategory` interface.
+
+| Property | Description |
+| --- | --- |
+| id | Unique identifier of the category. Also used to access QueryBuilder customisations for a particular widget. |
+| name | Public display name for the category.  |
+| enabled | Toggles category availability. Set to `false` if you want to exclude a category from processing. |
+| expanded | Toggles the expanded state of the category. Use it  |
+| component.selector | The id of the Angular component selector to render the Category |
+| component.settings | An object containing component specific settings. Put any properties needed for the target component. |
+
+Every component can expect different set of settings.
+For example Number editors may parse minimum and maximum values, while Text editors can support value formats or length constraints.
+
+You can use `component.settings` to pass any information to your custom Widget using the following interface:
+
+```ts
+export interface SearchWidgetSettings {
+    field: string;
+    [indexer: string]: any;
+}
+```