Issue #3100494 by mglaman, JordanDukart, bradhawkins: Facets module support

composer.json

modules/jsonapi_search_api_facets/README.md

...napi_search_api_facets/jsonapi_search_api_facets.info.yml

..._search_api_facets/jsonapi_search_api_facets.services.yml

...cets/src/EventSubscriber/AddSearchMetaEventSubscriber.php

...i_facets/src/EventSubscriber/SearchApiQueryPreExecute.php

...i_facets/src/Plugin/facets/facet_source/JsonApiFacets.php

...s/src/Plugin/facets/facet_source/JsonApiFacetsDeriver.php

...ts/src/Plugin/facets/url_processor/JsonApiQueryString.php

...facets/src/Plugin/facets/widget/JsonApiResponseWidget.php

...earch_api_facets/tests/src/Functional/IndexFacetsTest.php

src/Event/AddSearchMetaEvent.php

src/Event/AddSearchMetaEvents.php

src/Event/Events.php

src/Resource/IndexResource.php